You blind Preterists have fundamentally misunderstood the Olivet Discourse. Christ was not merely speaking about "Judean Christians," ethnic Judea, or the destruction of an unholy physical temple in 70 A.D. His prophecy ultimately concerns His New Testament congregation at the end of the age when Satan is loosened after the testimony of Two Witnesses is finished.
What many fail to recognize is that after the Cross, God identifies His people as spiritual Jews (Romans 2:28-29), members of the heavenly Jerusalem (Galatians 4:26) which are in spiritually Judea, and living stones of God's spiritual temple (1 Peter 2:5). The true holy place is no longer a physical building in earthly Jerusalem, but the Church of Jesus Christ spread throughout the world.
The Great Tribulation is not primarily about unbelieving Jews in the first century. It is a period of testing and persecution that comes upon the elect as false prophets and false christs infiltrate the visible church, exactly as Christ warned (Matthew 24:24). God's people struggle to maintain their testimony amid widespread deception.
This is why Revelation speaks them as the two witnesses whose testimony is finished and who are overcome by the beast (Revelation 11:7). Their bodies lie in the great city, symbolizing the end of the faithful witnesses because in God's eyes, all Elect has been secured (Revelation 7:1-4). The visible church now becomes increasingly apostate. Woe upon her as "mother" is no longer able to nourish her children of the congregation with the truth.
Then comes the turning point. "Immediately after the tribulation of those days" (Matthew 24:29), God sends the Spirit of Life upon His elect, opening their eyes to recognize the abomination of desolation standing where it ought not (Mark 13:14). They discern the corruption that has overtaken the unfaithful church and obey God's command to come out from her. That is why they no longer experience the great tribulation within the congregation and they now will see the signs in the sun, moon and stars that point to the judgment of the unfaithful church!
This is precisely the message of Revelation 18:4: "Come out of her, my people, that ye be not partakers of her sins." The judgment is not merely against 70AD Jerusalem but against the apostate christian church all over the world that has become corrupted. The elect are called to separate themselves from falsehood before God's final judgment falls upon the church where many professed Christians who have not yet seal by God are going to receive the mark of the beast so that they will belong Satan. They will be as lost as the rest of the world.
The Olivet Discourse, therefore, is not a prophecy exhausted in 70 A.D. It is a warning and instruction for Christ's Church as she approaches the end of the age and awaits the visible return of her King.