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I actually think as a pure work out game .... EA Active is more effective than Wii Fit.
Nintendo's strength shows in games where they're really able to flex their design muscle -- like Mario, Zelda, or Metroid. No offense to Wii Sports/Fit, but it's kinda like a great movie director doing TV ... nothing wrong with that, and its popular, but probably not the pinnacle of Nintendo design.
Back to the DS successor, which is what this topic is about, I think what Nintendo would want is to get a big screen size without having to have two screens (which causes for a very large system) while keeping backwards compatibility with the old DS.
Besides, it would be funny to see MS get completely and utterly screwed like that ... no casual would buy Natal + 360 if there was a Wii 2 + camera + newer Wiimote available.
