Daniel 2:34 (ESV)

34 As you looked, a stone was cut out by no human hand, and it struck the image on its feet of iron and clay, and broke them in pieces.

The world’s empires do not have the last word. In fact, the entire imposing image is struck by a piece of stone that comes loose in history. God shows this to Nebuchadnezzar. In doing so, God’s message is that it is not the world empires or the people who decide the future, and that necessarily includes Nebuchadnezzar. Under God’s government, something will happen that will put an end to all power that stands in opposition to him. People have no hand in the stone that overthrows everything. It happens under the rule of God as King. The image will be completely shattered.