Well, reports from the beginning have indicated that Wii U's architecture is pretty similar to the 360's. If that's the case, and if the next Xbox ain't too much stronger than Wii U, and if their controllers have all the same buttons, I'd say the odds are at least better than what they had with Wii. Of course, Nintendo also has to treat the third parties well, something I believe they're known for ****ing up.
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Watch and you'll see... someday I'll be... part of your world!