30 Verily I say unto you, that this generation shall not pass, till all these things be done.
How could these words be addressed to Christians living in 150 CE, when the generation under Pilate was already entirely dead?
BEST ANSWER: only if "these things" that have to "be done" are not only the mere destruction of the Temple, but still events that will happen after the 70.
The point is that between Mark 13:2 (allusion to the destruction of the Temple by Titus):
2 “Do you see all these great buildings?” replied Jesus. “Not one stone here will be left on another; every one will be thrown down.”
...and Mark 13:30 :
30 Verily I say unto you, that this generation shall not pass, till all these things be done.
...many events had to happen, according to the "prophecy":
Such things must happen, but the end is still to come.
(Mark 13:7)
There will be earthquakes in various places, and famines. These are the beginning of birth pains.
(Mark 13:8)
So the "kingdom against kingdom" could only refer to the only two kingdoms existing after the 70 CE:
1) the Roman Empire
2) the Kingdom of the Parthians.
...And we know very well the good work of Trajan in Parthia.
There will be not more a Jewish rebellion, after Bar Kokhba:
because those will be days of distress unequaled from the beginning, when God created the world, until now—and never to be equaled again.
(Mark 13:19)