I'm guessing the cape would control similarly in 3D, though. My point is that nearly all the Mario power-ups could be translated fairly easily to 3D, whether or not the game is collection-based (which I actually hope it is, that being my favorite style of 3D platforming). Even the grow using mushroom/shrink when hit system could be included. There's no real reason they couldn't.
i agree with you, but nintendo is never quick on the uptake