None of them. They all have reasons that they could leave/be forced out, but I don't think any of them will actually happen.
I think Sony will pull it together again with the PS4, I think Nintendo will continue to make profits even if they don't sell well, and MS... would be who I'd pick if I had to pick one. But they've got 360 momentum, tonnes of money, and Halo, I think they'll be alright.







