So you think a good alternative would be to release it as a NX launch title? How many people are questioning getting the NX at launch? They need to please their fans this gen before moving on. If they have any common sense they would realize selling a million or two more won't be worth alienating their diehard fanbase.
Yes, I think that would be the better alternative. I expect it to be a cross-gen title, by the way. Wii U owners will get their Zelda game but NX owners will get a better version in 1080p at 60fps and maybe some other added stuff. I'm not saying any of these alternatives is great but Nintendo needs to keep their home console business alive. They can't release Wii U games in 2017 with the console basically being dead. That would be a huge money sink.
I feel your pain, though!
With big releases comes big swells in console sales. The only thing that held the Wii U back this gen from doing respectable numbers is the fact there were so many game droughts. When Zelda Wii U releases, we can expect another home console sales swell.
As for whether the Wii U is a money sink hole, I think the fact that their fiscal year financial report was in the green means that they can still support the Wii U just fine until 2017. I think it would be a good idea to do this as well being that every Wii U and game sold, Nintendo makes a profit. The worst thing they can do is rush a new console out instead of making sure whatever this new consoles "thing" is, it can be fully realized. They should have had a game blowout at E3 this year to spark some interest again, showing their hand for 2016 but that is in the past.
What they do need to do is make sure their home console is stupidly easy to port the definitive versions of third party games to the console. They need to make sure that Monolith Soft and EAD whatever (the one that's making the Mario NX game) have games ready to launch when the console releases. Being that Retro said making a Metroid game now would be ready when NX launches is an insight to what is actually happening and why we haven't heard what their game is (though I would be fine with learning it's Metroid Wii U) that they have been working on since Tropical Freeze.
And hell, a great starting place for the new Nintendo console would be to launch at $350 to keep the price similar to the PS4 while offering a "better experience".
These things would help out FAR more than just announcing a cross gen title of LoZ. I think some people are placing far to much importance on the series like it can carry a new console.