http://www.independent.co.uk/life-style/gadgets-and-tech/news/elon-musk-ai-artificial-intelligence-computer-simulation-gaming-virtual-reality-a7060941.html
He's parroting Bostrom here, that the only chance we're not in a simulation is that civilizations blow themselves up before they get to a point where they can simulate things. (Because if civilizations DID get to a point where they can simulate things, than odds are very good that we're in one of their simulations). Therefore, we better hope we're in a sim, otherwise we're one of those civilizations that's about to blow itself up.