The problem with this is that you're making grand assumptions.

We know Zelda's coming next year. We don't know NX actually is. Not because of fan-made time requirements but because Nintendo is crazy. They could release it, and it would make sense and be mildly smart, but they could also easily push it to 2017.

NX also doesn't need Zelda for a strong launch. Seeing as we didn't know there was a Pikmin 4 until today, that also means we don't know about any other games. For all we know, there could be tons of other big games being worked on specifically for NX that they've been keeping secret on that will make NX a huge launch. Zelda doesn't have to be the main one.

That said, I don't care what they do as long as it is still on Wii U. I will get NX, but I want to play Zelda -now-. I don't want to wait until I can afford another system + a bunch of big launch games to justify getting it so early.

I just feel like we've already been in this position with Skyward Sword and despite Wii being dead LONG BEFORE SS came out, it still released on Wii alone. Not even a later port to Wii U like all the 3rd parties did with XBO/PS4 the first year (and still doing).

Because TP did it, one time, every time a Zelda comes out near the end of a console's life now it's like "WHELP, GONNA GET PORTED TO THE NEXT SYSTEM". If it happens, it happens, but tons of "evidence" points to lots of things that Nintendo would be "stupid" not to do, and yet here we are, with tons of awful decisions.