Where in Scripture are you getting all of this? Is it just your opinion or can you back it up? I don't remember reading any of this in the Bible? Are you just making an assumption?
The reason for cultivating the 70 was so that by the time of Pentecost and the Spirit, there would be about 200 people ready to go out with the message. Mt 10's instructions are similar to and sometimes repeated in Mt 24 because they were to head out to preach everywhere before the day of judgement came. The day of total judgement was thought to have been 'right after' (Mt 24:29) the destruction of Jerusalem. The DofJ is taught in Mt24A because they wanted to know why he had declared Jerusalem desolate in ch 23--or at least what that would look like.
Everything Paul says about that generation is framed that way, without any thought of delay between the DoJ and the final judgement. It is only in others that we learn of allowances for delay (Mark's parable of 4 possible return times, Matt's 'only the Father knows', 2 Peter 3). Notice that Peter: 1, validates Paul's letters but 2, also says there are things hard to understand--in the same chapter in which he is explaining why the final judgement has not yet happened!.
Paul is confident, twice, in saying that the whole earth has been reached in that generation, which was the goal he understood he was supposed to reach. I assume he adopted how the Roman world viewed things at the time, as was the same in Luke (Acts 2--the languages from the 'whole world.')
Israel's options: either join the mission of God, putting all your possessions into funding it (Acts 5) OR you stay there and fight Rome in a delusional messianic battle. The appeal to Israel along these lines is found in many places in Luke (Paul's teaching), in Rom 10 about the mission Israel should be doing, Rom 11. The horrible falling away after the son of perdition in Thess letters is about the leader of the Jewish revolt and his use of the temple. He is the figure leading the rebellion mentioned in Dan 8:13, the rebellion that desolates Israel, 9:27. Those are all events dated by those prophetic passages.
The letter to Hebrews tells that generation of Israel it is like that old generation in the wilderness that needs to listen to the voice providing them rest, not the disaster of sin. Otherwise their land will be burnt.
The problem you are having is the evacuation of historical reality by Dispensationalism. It is a system that is full of factors and contingencies completely outside of the apostles thinking and teaching, such as restoring a theocratic state to Israel. Those factors are unnaturally glommed-on to a few texts, mainly Mt 23's 'until you sing blessed is he who comes...' and Rom 11's 'all Israel saved.' They believe this is 'rightly dividing' the Bible, which is bad English for 'rightly handling' the Bible in light of ignorant people who want to scrap over terms and words from the Law instead of using the Bible to administer church leaders and people effectively, I Tim 2. D'ism started in the 1800s when there was a flourish of off-base cults with major delusions at the center. They drifted way off the center of the Bible.
The odd thing about this is that one pastor who stuck with the historical view (no glommed-on 2P2P type theories) dealt a massive blow to the leading atheist writer of the day (I'm referring to Pastor Holford's ministry vs Thomas Payne's attempt to end all religion). This was early 1800, and it is fascinating to note what happens next: uniformitarianism AND several bizarre cults start up, including D'ism, but none of them maintain the grip on history and the solid connection between the NT and the destruction of Israel that is all through it.
Which makes tragic sense: once you cut the NT loose from that, all the awful beliefs of those systems take over. Futurism did it by thousands of reps that Mt 24A was about events X000 years in the future, and by cultivating the resurgence of Judaism's interest in its own trinity--God / torah / land in the 1800s. In a cultic way, and out of nowwhere, there was now a "Christian" and even "evangelical" movement that had almost no understanding of NT history or how the NT used the OT to maximize the accomplishment of Christ. Which means they read the OT the EXACT SAME WAY AS THE RESURGENT JUDAISM!!! D'ism has had no effect on the modern world that would subvert it from uniformitarianism; it simply burps up a 'prediction' about once a decade, which comes and goes, and the public sneers.