64 Jesus said to him, “You have said so. But I tell you, from now on you will see the Son of Man seated at the right hand of Power and coming on the clouds of heaven.” 65 Then the high priest tore his robes and said, “He has uttered blasphemy. What further witnesses do we need?
It is my argument that this is an intentional effect of the imagery of the vision. The purpose is not so much writing history in advance as making a theological statement about the conflict between human evil and God.
The best way to view the imagery of Daniel 7 is not in terms of four specific evil empires, but as four kingdoms symbolically representing the fact that evil kingdoms (of an unspecified number) will succeed one another from the time of the Exile to the time of the climax of history, when God will intervene and once and for all judge all evil and bring into existence his kingdom.
26 “ ‘But the court will sit, and his power will be taken away and completely destroyed forever. 27 Then the sovereignty, power and greatness of all the kingdoms under heaven will be handed over to the holy people of the Most High. His kingdom will be an everlasting kingdom, and all rulers will worship and obey him.’