To be honest if they want to maximize Zelda U's sales, moving it to 2016 as part of a broader 30th Anniversary thing and making it a dual release (Wii U + Fusion launch title) would probably be the smartest move.

Moving Twilgiht Princess away from just the GameCube to being a Wii launch title probably doubled the sales that game would've got otherwise. 

And while it seems a little silly quite a few Nintendo fans were pissed off at the time that Nintendo did it, but it turned out to be 100% the correct call. 

If Nintendo needs more people working on Zelda, they will delay some other project, like Starfox or something we don't know yet. They need Zelda selling consoles the sooner the better.

One can hope...

If NSMBU, Smash, 3D Mario, and Mario Kart cannot get Wii U's to sell to a consisently high level then Zelda isn't gonna do squat. 

It'd be nice to have it for 2015, but I don't think it's life or death. What the Wii U is isn't going to change because of a Zelda release date. 

To be fair, Nintendo have confirmed release dates before then delayed them.

Yes, I think it will be release in 2015. Considering they had enough time to put in tiny details such as multiple types of "grass", grass-explosion physics, and goats, the bare bones of the game should already be done and are currently fleshing it out everything else (I hope). Then, hopefully they can move onto testing and debugging in spring-early summer next year.

TP was the right call because the release actually coincided with Wii`s release. The same almost happened with DQ X, if i`m not mistaken.
In that situation it made perfect sense to port the game. If they didn`t, with all the Wii hype people would forget about the Zelda.

Honestly, i have no idea if people liked the idea or not. I didn`t mind. One way or another, i was going to play it! :D

The problem with this one is if they delay the game what else do they have for holidays 2015?
With MS and Sony coming with big titles, Nintendo can`t afford to be overlooked. They are making a profit now, but they need to make a whole lot more to tell investors that Wii U, in the end, made them money. If they just call it quits and whatever happens, happens, they are not only harming Wii U's small potential, they are also hurting the generation after Wii U.
What gamer will be confident on Nintendo`s word if they don`t really try their hardest to make Wii U a worthwhile purchase?

If they can replace Zelda for Holidays 2015 and the next gen really starts in 2016, by all means. I`d rather play the game in 2015, but i`ll still play it in 2016.

Well if Nintendo needs more time to make it great then hopefully they do that. A lot hinges on this game for the franchise. When you get down to it TP and SS were back to back disappointments in that didn't live up to what they were supposed to be or bring a whole lot new to the table. The franchise hasn't had a truly memorable and defining installment since Wind Waker over a decade ago. I'm afraid if this is just "another good Zelda game" the franchise could really go stagnant. We need it to make a big impact on the industry. So if it needs to be 2016 for that, then by all means Nintendo...

Disappointments based on what? Twilight Princess sold twice as much as Wind Waker.

True, which is why I spent the rest of my post giving supporting arguments and theories to support my hypothesis. :)