This is just my speculation but would Jesus have established His millennial kingdom on Earth already IF the Jews, on a nationwide basis, accepted Him as their Lord and Saviour?
"So he said, “A nobleman went to a distant country to get royal power for himself and then return. 13 He summoned ten of his slaves, and gave them ten pounds,[a] and said to them, ‘Do business with these until I come back.’ 14 But the citizens of his country hated him and sent a delegation after him, saying, ‘We do not want this man to rule over us.’ 15 When he returned, having received royal power, he ordered these slaves, to whom he had given the money, to be summoned so that he might find out what they had gained by trading. 16 The first came forward and said, ‘Lord, your pound has made ten more pounds.’ 17 He said to him, ‘Well done, good slave! Because you have been trustworthy in a very small thing, take charge of ten cities.’ 18 Then the second came, saying, ‘Lord, your pound has made five pounds.’ 19 He said to him, ‘And you, rule over five cities.’ 20 Then the other came, saying, ‘Lord, here is your pound. I wrapped it up in a piece of cloth, 21 for I was afraid of you, because you are a harsh man; you take what you did not deposit, and reap what you did not sow.’ 22 He said to him, ‘I will judge you by your own words, you wicked slave! You knew, did you, that I was a harsh man, taking what I did not deposit and reaping what I did not sow? 23 Why then did you not put my money into the bank? Then when I returned, I could have collected it with interest.’ 24 He said to the bystanders, ‘Take the pound from him and give it to the one who has ten pounds.’ 25 (And they said to him, ‘Lord, he has ten pounds!’) 26 ‘I tell you, to all those who have, more will be given; but from those who have nothing, even what they have will be taken away. 27 But as for these enemies of mine who did not want me to be king over them—bring them here and slaughter them in my presence.’”- Luke 19:12-27
It seems pretty strange that a nobleman would go to some place to get power, only to go back where he came from. Was this due to his subject's contempt (in particular the Pharisees since these rebels sent a delegation) of this nobleman, which was further intensified in verse 14, even AFTER this nobleman declared his intention to leave this nation?
And considering that Jesus was prophesised to be the ultimate atoning sacrifice for humanity, would the Jews have been willing to sacrifice Him? Or would God have the Romans do the dirty job?