For me it comes down to potential of the ideas, albeit one hypothetical, one not. I'm merely stating from a pure game/level design perspective the Upad (in my opinion) offers a wider breadth of ideas to translate into fun, practical, deep gameplay. And what may not be knowm due to what I've said, is I was actually pleasantly surprised by the motion controls in function and even feel, mostly in reliability which impressed me. I just don't feel they were a big enough boon to the Zelda series, based purely on SS that they deserve a 2nd shot on the same tech. Not when other more practical ideas are right in front of us. But that's just where I stand on it, in light of Zelda team heads proclaiming "more motion".
I'd be interested to see (off topic though) exactly what, where and how people consider the motion controls "good" as opposed to button centric alternatives. Is it just the "new fresh feel" or is it something in how they were executed that meshed with game design and/or more substantial that stands the test of time vs. buttons?