However, Paul's calling and ministry were entirely because Israel, as a nation, would not repent before Messiah. That's why "this generation" didn't see what you pretend they saw. That's why there was a need for the previously unrevealed Gospel of the grace of God, the terms of which were not those of the Gospel preached during the four Gospel accounts or in early Acts. In short, a new, previously unknown Good News where God swept aside all national and ethnic distinctions, which Paul called "my Gospel." A new Gospel.
Nothing but Dispensational rubbish straight from John Nelson Darby.
Jesus said "Verily I say to you".
You want us to believe that if Israel had repented things would have been different.
Jesus didn't say "Maybe, Verily I say to you".
You make Jesus an idiot.
Jesus knew exactly what was going to happen.
There was no "new, previous unknown Good news". It was all part of God's plan.
Quit following Darby, and believe what the Bible says.