I think the clue to the end of it all is when Jesus is identified as the son of man. The apostles asked him the three questions while sitting on the mound of olives:
Matthew 24
1. When will these things be? - Throwing down of the physical temple.
2. Sign of your presence - Where he is not to be found anywhere but his influence is more like the lightning effect.
3. Conclusion of the system of things - When he comes as the son of man in the heavens and when the powers of the heavens are shaken.
Luke 17:22 records Jesus as saying this statement to his apostles, "Days will come when you will desire to see one of the days of the son of man, but you will not see it."
My understanding from this scripture is that those who heard Jesus say these words will not be around when he comes in power as the son of man in his second coming. These people were alive when he ascended into the clouds but they never witness his return. I can only assume that word "generation" is not the right word to use in Matthew 24:34. it should be replaced with the term Jewish Nation. I guess this labels me an apologetic in trying to make sense of the bible. So be it.