My two cents worth, as a person who is loosely dispensational and exploring it to see if what I have been taught is true...
I have one question for those who think the sermon on the mount is entirely, directly applicable to the church today:
What do you do with Matthew 5:19?
Are we under the law of Moses as Matthew 5:19 says? Or are we not under the Law of Moses as Paul lays out in Galatians, and as the Apostles all agreed upon in Acts 15?
No other systematic theology can account for the apparent contradiction (at least I've never heard any other valid argument that reconciles the passages).
As for finding gaps in prophetic passages, how about noticing that Jesus found one...
Luke 4:16-21 NASB And He came to Nazareth, where He had been brought up; and as was His custom, He entered the synagogue on the Sabbath, and stood up to read. (17) And the book of the prophet Isaiah was handed to Him. And He opened the book and found the place where it was written, (18) "THE SPIRIT OF THE LORD IS UPON ME, BECAUSE HE ANOINTED ME TO PREACH THE GOSPEL TO THE POOR. HE HAS SENT ME TO PROCLAIM RELEASE TO THE CAPTIVES, AND RECOVERY OF SIGHT TO THE BLIND, TO SET FREE THOSE WHO ARE OPPRESSED, (19) TO PROCLAIM THE FAVORABLE YEAR OF THE LORD." (20) And He closed the book, gave it back to the attendant and sat down; and the eyes of all in the synagogue were fixed on Him. (21) And He began to say to them, "Today this Scripture has been fulfilled in your hearing."
And when one looks at the passage in Isaiah that He was quoting, one finds that Jesus stops mid-sentence, showing that the rest of that verse had yet to be fulfilled. Here is the entire passage in Isaiah:
Isaiah 61:1-7 NASB The Spirit of the Lord GOD is upon me, Because the LORD has anointed me To bring good news to the afflicted; He has sent me to bind up the brokenhearted, To proclaim liberty to captives And freedom to prisoners; (2) To proclaim the favorable year of the LORD And the day of vengeance of our God; To comfort all who mourn, (3) To grant those who mourn in Zion, Giving them a garland instead of ashes, The oil of gladness instead of mourning, The mantle of praise instead of a spirit of fainting. So they will be called oaks of righteousness, The planting of the LORD, that He may be glorified. (4) Then they will rebuild the ancient ruins, They will raise up the former devastations; And they will repair the ruined cities, The desolations of many generations. (5) Strangers will stand and pasture your flocks, And foreigners will be your farmers and your vinedressers. (6) But you will be called the priests of the LORD; You will be spoken of as ministers of our God. You will eat the wealth of nations, And in their riches you will boast. (7) Instead of your shame you will have a double portion, And instead of humiliation they will shout for joy over their portion. Therefore they will possess a double portion in their land, Everlasting joy will be theirs.
Note that Jesus ends mid-sentence... "the day of the vengeance of our God" is yet future even now. And who is this passage given to? Jews. And who was Jesus speaking to? Yep, Jews. That's right, the rest of this passage has never been fulfilled in history (although there may be an ongoing partial fulfillment today as Israel has returned to their ancient home and is rebuilding), and yet it
will be fulfilled completely and literally, just like the 1st half of the passage was fulfilled by Jesus during His earthly ministry.
Just a little food for thought...