Wii U isn't selling well enough to get that many Mario games. NSMB, NSLU, Mario Maker, and Mario 3D World is quite a lot already, it's more Mario platforming than the SNES, N64 or GameCube got. Yes the Wii had two 3D Marios, but it also sold 100 million systems, Wii U is way off.
Mario on the next-gen Nintendo (handheld?) makes more sense.
Everything points to 2016.







