Don't doubt it at all. Power isn't anything like an issue even now for mobile platforms. They could obliterate the 3DS and Vita as it is.
The problem with mobile platforms is the woeful quality and/or production values of the games.
And so long as its Free 2 Play or 99p or bust, I don't see it being a viable threat to dedicated gaming, even if it does soak up the casual market.








