I would say the price cut. The 3DS was having weak sales in the beginning, but they picked up after the price cut.
I imagine that the majority of the people who own a WiiU are already looking forward to MK7 and Smash. SM3DWorld has solid sales, but it didn't really increase WiiU numbers. So I expect something similar when those games releases. Also, Smash is coming out on the 3DS which will eat up some of WiiU's interests.









