I have a feeling that the Wii U could pull a DS or 3DS move if Nintendo plays their cards right.... I remember the DS not doing too hot until the DS Lite came out then it blew up.... There were tons of naysayers for the 3DS in the beginning too.... I heard so many rants about how it was going to fail.... Is it a thing to hate on Nintendo no matter what they do~? How many times does a company have to prove itself before they get the benefit of the doubt for once~?
While I would like that, I still don't think Nintendo can turn around the Wii U. It's simply losing too much third party support and it actually has competition with the other systems. For the 3DS, there was only the Vita which isn't much competition at all and it's the best way to have handheld mobile gaming, even with the cry for Nintendo to go mobile.
I think the Wii U will pull itself around just a bit, we have some big games coming out this year, but I don't think it'll be enough for the system to ever make the same numbers of the Wii. They just didn't do a good enough job selling the system. I don't think it'll fail though. Nintendo is much smarter with what they do. They'll struggle, but never fail, they'll never become Sega.