That Rock, of course, is the Messiah. He's the One who smashes (or smashed) the world systems and replaces them with his own. Now, was this when he came the first time, or is it referring to when he returns? I think it’s both. I think the process started when he came the first time, and it’ll be completed when he comes back.
I think there are two lessons we need to glean from this. First, the statue is the way the world works. It’s all glittery and majestic and imposing and impressive and intimidating. One kingdom comes after another after another after another. People think the new kingdom will be much better than the last one, and they end up disappointed (at best). But ah, when the Fifth Kingdom arrives, then we see a change! The Old Order is obliterated and the New Order has come!
The question is, “Am I part of the Fifth Kingdom, or am I a citizen of this world?” And if I do belong to the Fifth Kingdom, do I act like it?
Lord Jesus, I can’t wait until you return to complete the setup of your glorious Kingdom. Or can I? Is that something I really want, or is it something that would upset my little order of things? Whether now or later, my little personal kingdom has got to fall. Let’s do this the easy way, shall we?