You're kidding yourself on this one for two reasons one you won't get a X1 level portable in 4 years due to battery life, heating and so on as well as the price that would make the PS3's and X1's launch prices look cheap, specs on portable devices work in a different manner. Secondly if Sony got blown out the portable market trying to support two platforms and Nintendo had to go hybrid to support both markets what makes you think MS can release 2 platforms when they have enough problems at the moment trying to keep one going?