I think that they simply want Zelda U to be the best it is, and if Nintendo sees an opportunity to do so, they will probably take that chance, which I think is happening right now.
About it being on NX, It simply won't and shouldn't. You can argue that Twilight Princess was planned on GC but released on that and the Wii, but the GC already had its own canon Zelda game, the Wii U however does not. Its because of this that Zelda U will not be on NX, If you were to go by the logic most people are going, then Skyward Sword should've been on Wii U as well since it was close to its release, but it wasn't.
And I don't think Nintendo would ever want to downgrade Zelda U, its one of their biggest titles ever possibly. Plus, why the hell would it get downgraded if its been delayed to be better than it is? That kind of logic is stupid.
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