Third parties don't have any obligation to support any platform. They're the ones paying for the game's development and they pay the $10/copy licensing fee even if the game doesn't sell (Sony/MS/Nintendo collect money off licensing fees regardless of if these third party titles sell or not).
As such they can do whatever they want.
If they don't want to support platforms like the Wii U, Sony Vita, Atari Jaguar, Sega Dreamcast, Sega Saturn, Sega 32X, GameCube, and whatever other format that sells like crap you can come up with, there's nothing wrong with that.
If Nintendo wants third party support then they can start by making a machine third parties actually like within sensible, modern design choices. If they want to make weird hardware with priorities based on what a Japanese housewife would like in a game console, then they're within their rights to do that too. Just don't expect developer support. End of story.
As far as I can tell there's not even one person at Nintendo with any real power who even understands the Western market, Iwata himself says he's not great at understanding the Western market (yet he apparently promoted himself as head of NOA), Reggie is just a glorified PR mascot at this point, Miyamoto is living in 1989, where something like Project: Giant Robot would be a good idea.
That Zombi U number is likely grossly overtracked. My Best Buy has been sitting on the same giant stack of Zombi U copies from 2012 that are available for $19.99 (sometimes they even cut it to $14.99) and they're just constantly collecting dust. Huge success my rear end, I get the feeling this game is also massively overtracked at VGChartz.
