It's way to soon in the WiiU cycle to tell if they'll make another console. Sales aren't great, but at the same time they haven't published any real 1st party games yet beside pikmon and new super mario bros. After Super Mario 3Dworlds, new smash, new zelda, new kirby, new donkey kong, I'll imagine you see if sales are where they want.
I heard that the sales are on par with the GameCube so take that for what it's worth...
Also, Nintendo screwed up with the name... Should have called it the Wii 2. I have no clue what the U is supposed to mean... And I think the Xbox 720 would have been a better name but maybe they are trying to pull a Sony with number sequences (Xbox1,2,3,4 etc.)
I feel the whole marketing strategy for the wii u was badly done, from the gigantic touchpad controller (which feel like a gimmicky angle ), marketing the system towards families instead of all gamers. I can't understand why Nintendo believe they can survive without the support of developers and gamers alike. There are reports that by next year the wii u might be discontinued due to its extremely poor sells. Even the GameCube sold more units and that was Nintendo's first failed console. I doubt this will keep Nintendo down. They will get it right with the next console besides what console can say that they can survive with making Zelda,Mario and Pokemon games.