Give me one good reason why neither Matthew nor Mark would think it was worthwhile to record His answer to that question?
Matthew 24:3 And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and what shall be the sign of thy coming, and of the end of the world?
Matthew 24:5 For many shall come in my name, saying, I am Christ; and shall deceive many.(does not involve what happened in 70 AD)
Matthew 24:6 And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet.(does not involve what happened in 70 AD)
7 For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places.(does not involve what happened in 70 AD)
8 All these are the beginning of sorrows.(does not involve what happened in 70 AD)
9 Then shall they deliver you up to be afflicted, and shall kill you: and ye shall be hated of all nations for my name's sake.(does not involve what happened in 70 AD)
10 And then shall many be offended, and shall betray one another, and shall hate one another.(does not involve what happened in 70 AD)
11 And many false prophets shall rise, and shall deceive many.(does not involve what happened in 70 AD)
12 And because iniquity shall abound, the love of many shall wax cold.(does not involve what happened in 70 AD)
13 But he that shall endure unto the end, the same shall be saved.(does not involve what happened in 70 AD)
14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.(does not involve what happened in 70 AD)
Right after verse 14 is apparently when the end is meaning. Meaning that Matthew 24:15 begins the time of the end, thus leads to the literal end at the end of it all.
Matthew 24:15 When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand: )
In Luke 21 it never records that this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come, prior to verse 20. But why not? It records it in Matthew 24 and Mark 13, prior to mentioning the AOD. That is because Luke 21:20 doesn't involve the end, but that Matthew 24:15 through the remainder of that chapter does. Clearly, this in Matthew 24:3---and of the end of the world--does not involve anything recorded in Luke 21:20-23, yet involves what is recorded in Matthew 24:15-51.
Nothing recorded in Matthew 24:15-51 involves anything recorded in Luke 21:20-23. And that is the problem with some of these interpretations, including yours. You have some of Matthew 24:15-51 involving Luke 21:20-23 when none of it is. Even though Preterists are just as wrong as you are about some of these things, at least they are being consistent about things. Unlike you, though they too have Matthew 24:15 paralleling Luke 21:20, they don't have the sun going dark 2000 years after when they have Matthew 24:15-21 and Luke 21:20-23 meaning.
Matthew 24:21 is not meaning persecution of unbelieving Jews in the first century, it is meaning the persecution of the church. Even though the church was being persecuted in the first century, it was never at a level that matches any of the following.
Matthew 24:21 For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.
22 And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened.
It seems unreasonable to assume the elect meant in verse 22 are meaning unbelieving Jews in the first century. If meaning them, verse 22 would have to be understood like such----And except those days should be shortened, there should be no unbelieving Jews remaining alive: but for the unbelieving Jews' sake those days shall be shortened.
But if we have the elect in verse 22 meaning the church, that verse would be basically saying this---And except those days should be shortened, there should no saint of the church remaining alive: but for the church's sake those days shall be shortened. Which then totally disagrees with what happened in 70 AD, that the church would have gone extinct had not those days been shortened. History records that most of the church, or maybe even all of, exited to safety, not instead stayed behind and were slaughtered with the unbelieving Jews.
But let's not factor in one single thing I posted in any of the above, let's just insist that Matthew 24:15 is involving the same period of time Luke 21:20 is involving. Thus there is really nothing to debate.
While I can't explain what Jesus meant by fleeing into the mountains in Matthew 24, if not meaning pertaining to 70 AD, well there's a lot of things I can't explain in the NT, and probably neither can you, but that doesn't have to mean it is therefore literally involving what it appears to be saying.
For example.
Revelation 9:5 And to them it was given that they should not kill them, but that they should be tormented five months: and their torment was as the torment of a scorpion, when he striketh a man.
6 And in those days shall men seek death, and shall not find it; and shall desire to die, and death shall flee from them.
If I can't explain what this means, and that if you can't explain what that means either, does that then mean we have no choice but to take it to literally mean what it says, that, though one wishes to die, it is impossible to die during this 5 month period?