What they should have done is made a more competent powerful console and use the 3DS for remote play like Sony did with the Vita for the PS4. Maybe you can do that already? Either way...
I actually like that idea. That would probably have allowed Nintendo to gain some of the "hardcore" crowd back that they've lost over the years. As it stands, I think the Wii U is basically finished in terms of this generation of consoles. Sure, people will buy it when the next Zelda or SSB comes out, but they will probably never touch the console again once those games run their course. Sounds a lot like what happened with the OG Wii.....except people actually bought those by the millions.
Nintendo better have their engineers working on a console that they can bring out in the next 2 years or so. If not, I think we might see Nintendo go all portable. Apparently, that is where the Japanese market is heading anyway.