I mean theoretically we can never stop him, he will destroy the world.
So what is to say that he hasn't been stopped multiple times, just this time in our era the evidence was destroyed during the event in the oblivion crisis?
The only problem I see with this is, I think only a Dragon born would truly be able to stall his destruction, but we do know and elder scroll has stopped him before.
I mean it would be nice to see the World eater, maybe even in a Time travel Adventure zone :3