It would be good if Nintendo didn't have to jump to a new console and just wait the usual 5 years, but that doesn't seem to be the case.
Nintendo's biggest sellers for the home console are already out and Zelda is the last system seller they have left.
Also, despite DK, MK 8 and Smash being released in 2014 the overall sales for the year were what 500k more than 2013, which was a dysmal year.
Wii U hasn't got the diversity, 3rd party software, room for a price cut while maintaining a profit, to keep the console afloat 5 years, when GC barely achieved that with a way better library of games, lower price and enough money being made on the system.
Nintendo will be forced to do something big and they better do it sooner rather than later or their future in the home console market will be at risk. Investors are not going to like seeing Wii U losing revenue alongside 3DS.
