[I think that he was most likely referring to the generation which would be present to witness all of the particular signs of which he spoke.]
Absolutely correct. And that generation saw the rebirth of Israel in the land of Israel where the God of Israel is gathering them to bring in and fulfil the latter day prophecies that result in the 7 year wrath of God on all unbeleivers of men and Satan and his unholy angels (aka, the seven year tribulation), followed by the 2nd advent of Jesus Christ on the earth as Lord and King of all nations. The 21 seperate judgements on Israel and the whole earth is necessary to bring in the 1000 year rule of Jesus Christ on the earth.
Mankind can not do this as anyone who thinks and discerns knows, as the scriptures plainly teach unto those who believe and read the scriptures.
Joh 14:2 In my Father's house are many mansions; if it were not so, I would have told you; for I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I come again, and will receive you unto myself; that where I am, there ye may be also.
He said he was coming back to take them to where he was, which was, in heaven