I think the Wii U will be fine, in terms of making money for Nintendo, but nowhere near the hit of the Wii. Nintendo will keep supporting it with their games and there are enough core Nintendo fans to keep it viable
The Vita is the one to really be worried about as it is already fading from shelves in stores and if it doesn't pick up a bit of steam now, even Sony might abandon it, but I suppose there is still a long way to go for both







