Heat death which will lead to collapse. Its impossible that the universe is rapidly expanding as theres really no reason for it to. You would need a massive amount of mass being created currently and I dont recall seeing much evidence of that. If you believe in thermodynamics and even mildly in some parts of evolution I dont see why any conclusion other than an eventual Big Crunch would be the endgame.
It all returns to nothing
It just keeps tumbling down, tumbling down, tumbling down. (NGE)