You are assuming that the book of Revelation was intended for John's generation, which is not true.
Revelation 1 shows us that this book was written by John to HIS generation with a *generic* message about suffering that would apply to all generations.
1. THE LANGUAGE IS URGENT AND NEAR!
Revelation 1:1
"1 The revelation from Jesus Christ, which God gave him to show his servants what must soon take place."
SOON!
Revelation 1:3
"3 Blessed is the one who reads aloud the words of this prophecy, and blessed are those who hear it and take to heart what is written in it, because the time is near."
NEAR!
John expected the stuff in Revelation to begin during his lifetime! The persecution, the suffering, the tribulations, the safety of martyrs in heaven, the spiritual reign of Christ, it all started 2000 years ago.
2. JOHN SPECIFICALLY SAYS HE *ALREADY* SHARES IN THEIR *TRIBULATION*
Rev 1:9 "I, John, your brother and fellow partaker in the tribulation and kingdom and perseverance which are in Jesus, was on the island called Patmos because of the word of God and the testimony of Jesus." (NASB)
John shares their tribulation which had *already* started! It started 2000 years ago, and continues to this day. We see it in history and around the world *any* time a 'beast' government starts to kill God's people.
The Roman persecution against Christians would have been especially troubling to Jewish Christians who expected the Messiah to save Israel from her enemies. What was the point of belonging to this 'new' Israel of the church if it didn't guarantee any national or personal security? How were Christians to understand the eventual fall of the temple? John answers these questions. Revelation is primarily a theological sermon that covered where the true temple now lives, true security exists, and how our true home is being prepared.
It was written TO them and was ABOUT their trials and temptations. But it also applies generally to all Christians in all ages as we all suffer for our Lord. Just as 1 Corinthians was written specifically to the Corinthian church but is also God's word to all generations, so Revelation was written to specific Christians but the themes and message are timeless. (Well, for all Christians living in these Last Days which started in Acts 2!)
3. IT'S A GOSPEL SERMON THAT APPLIES TO ALL AGES, EVEN IF WRITTEN IN APOCALYPTIC LANGUAGE!
Revelation 1:2
"who testifies to everything he sawthat is, the word of God and the testimony of Jesus Christ."
The testimony of Jesus Christ is another way of speaking of the basic gospel message of the Apostles.
We know it is apocalyptic (a genre of writing common to Jews between 200BC to 200AD) because of the biblical symbols used in the book. In Revelation 1 Jesus is introduced in a similar style to the Son of Man before the Ancient of Days in Daniel. But then there's a New Testament twist. John mixes and matches his imagery to suit the theology of his sermon. "...and coming out of his mouth was a sharp, double-edged sword." The Sword is the Sword of the Spirit, the word of God. Jesus, the WORD, is about to speak to John!
John has specifically said this book is about the testimony of Jesus Christ and now adds a biblical symbol of the power of that testimony. The Sword of the Spirit is about to speak, so pay attention! Listen up! The Lord is speaking, and (as John has already said) it is a testimony about himself. That's the gospel. Hear and obey! "Blessed is he who reads and those who hear the words of the prophecy, and heed the things which are written in it; for the time is near."
Which is kind of hard to do if it is not even directed TO you or ABOUT you. But because this was the gospel being preached, it *IS* to us and about us, and all Christians until the Lord returns.
THE SCROLL IN REVELATION 5 IS ABOUT THE GOSPEL AS WELL!
John weeps that no one can open Daniel's scroll, as it contains the answer to the great mystery of how God was going to redeem his people. But Jesus can open it. Why? Because he "has overcome". And...
" Worthy are You to take the book and to break its seals; for You were slain, and purchased for God with Your blood men from every tribe and tongue and people and nation."
10 You have made them to be a kingdom and priests to our God; and they will reign upon the earth.
Jesus is the POINT of the whole bible, the subject of the scroll, and the answer to Daniel's question. Jesus is the one who saves people from every nation and creates a brand new kingdom and priests. The GOSPEL is the mystery from ages past now revealed to the Apostles. The scroll of Revelation 5 is not another question to solve but an answer to Daniel's conundrum! It's the gospel.
4. THE GOSPEL ITSELF HAS US THINKING OF THE LORD'S RETURN IN SALVATION AND JUDGEMENT
Critics of Amillennialism often argue that because the last few chapters describe Judgement Day the whole book must be a timetable. The problem is, the description of Judgement Day itself isn't a timetable! Judgement Day is described and repeated 3 times in various chapters at the end of the book. Rather than seeing Revelation as our own personal crystal ball and trying to guess specifically who and what each symbol 'is', we are meant to remember the *theological* importance of each image. And, surprise surprise, here we see the Lord's return is integral to the gospel sermon John is preaching in the first place!
Rev 1:5
"To him who loves us and has freed us from our sins by his blood, 6 and has made us to be a kingdom and priests to serve his God and Fatherto him be glory and power for ever and ever! Amen.
7 Look, he is coming with the clouds,
and every eye will see him,
even those who pierced him;
and all peoples on earth will mourn because of him.
So shall it be! Amen."
In verse 5 Jesus freed us from our sins. But thoughts of Jesus suffering lead John straight to His glorious return.
He is coming back the way he went, on the clouds. This is the ancient symbol of the Cloud Rider; a victorious and mighty ruler like the Ancient of Days. The return of the Cloud Rider is the Return of the King. It means Judgement Day.
According to John, the moment we remember Jesus died for our blood should also be the moment we remember his comforting words that although he suffered (and us with him!), he WILL return. Like any good introduction, John is letting us know what this book will be all about. We see generic picture language that explains the gospel hope of Jesus return to suffering Christians. We will NOT give in to persecution and temptation. We will NOT betray God and live for worldly wealth, worldly philosophy, and worldly powers. Because, in the end, the Lord *will* Judges them all. This is our gospel hope. It's not some weak future timetable that robs the book of relevance and meaning to us.
5. THERE IS NO WAY TO INSERT 2000 YEARS AND REMAIN FAITHFUL TO THE TEXT!
Revelation 4 is often quoted to support a big leap of time into the future.
"After these things I looked, and behold, a door standing open in heaven... Immediately I was in the Spirit".
Let us note that it does NOT say "Insert 2000 years here please, and then we'll move on to our timeline of future history!" That will not do. It contradicts John's command for *his* readers to hear and understand and obey the *gospel* message he is preaching, and it robs the verses above of their true meaning.
But John *does* give us a timeframe for his book. It is going to cover the Last Days. In Rev 1 he has already said "I was in the Spirit on the Lords day" which means he is thinking of the Age of the Spirit which finds its fulfilment on the great and terrible day of the Lord. Here it is again in Rev 4. "Immediately I was in the Spirit". "After these things" is moving on from the specifics of the letters to the 7 churches to general truths across the whole Last Days. A careful study of Acts 2 and Joel will also back this up. We are in the Last Days, and have been for 2000 years. Most of the images in Revelation are theological statements about suffering in the Last Days, not 'events' that must be decoded.
6. THE FACT OF JUDGEMENT DAY IN THE LAST CHAPTERS *STILL* DOES NOT MAKE THIS A TIMETABLE!
Some argue that Judgement Day is an event, therefore the whole book is a series of events, not symbolic sermons. But there's a problem. Judgement Day is described about 3 times in vivid imagery from different angles. Revelation 17, 19, and 20 all describe different aspects of the same Judgement of our Lord! This makes it even *harder* to see Revelation as a future timeline when it seems to waltz around the same things again and again! No, it's symbolically describing important theological truths about Judgement Day. Not arbitrary timetables.
John started off telling us in Chapter 1 that he was writing about the gospel, and the gospel leads to Judgement. We should not be surprised that the book deals with the harsh realities of our lives now, but culminates in our glorious hope! How many stories have you heard describe heartache and pain that is ultimately resolved and rewarded? John is the ultimate storyteller, only the story he's telling is the gospel itself.
7. A FUTURE TIMETABLE MAKES IT COMPLETELY INCOMPREHENSIBLE TO JOHN'S GENERATION.
* Covenant Amils see it as an incredibly PRACTICAL book for all Christians in all ages. It encourages them to not give into suffering and refuse to follow the worldly short-term gains of materialism and worldly power and success and sensuality.
* Futurists make it irrelevant to all but the last generation.
* Covenant Amils see Revelation as clear symbolic sermons that interpret themselves according to other symbols in the bible, and are applicable to all Christians in all situations.
* Futurists see it as utterly dependent on today's headlines, and therefore inaccessible to everyone before this generation.
* Covenant Amils use a consistent symbolic hermeneutic.
* Futurists use an inconsistent 'literal' hermeneutic which contradicts itself so frequently the system implodes. Does Jesus have 7 horns and 7 eyes or not? Is the book literal or not? Nothing futurists have said addresses the fundamental point that their literal hermeneutic is inconsistently applied.