Yeah would have been crazy to release a game for the WiiU now that every WiiU owner is completely starved for new games.
Better to delay it and release it when the software drought is coming to an end and everyone is playing other games.
Seriously, the 3DS did really bad at first too. It was doomed and so on. But it just had a weak launch-lineup and nothing much for the first few months. When we start seeing Mario Kart, 3D Mario, Zelda etc. released for the WiiU it will pick up, the only question is how much.
The thing here, though, is that in the handheld space their competition was Sony, and they only had a battle with them in terms of sales in Japan, many years into the PSP. The 3DS could get away with anemic sales because not only was it the first platform launched in the eighth generation, it had leeway to bloom because it had an entire marketplace to itself,
and had the time to make amends for any shortcomings. The Vita, conversely, has none of those going for it so it's struggling, badly.
The Wii U has already shot its early momentum of being the first eighth generation console out into the ocean. Their battle is to make consumers give a shit about their product when the core PS3 fan already has something to wet their whistle this month with the announcement of a new platform, as will the core 360 fan later on in the year.
The Wii U is in a far more dangerous climate than what the 3DS was in, and it's far more likely that it will not be able to pick itself up so rapidly, or even at all, because the timetable for its competition is so close to this downfalling for the platform in terms of sales and interest. It's looking like many consumers will just look over the platform.