Asriel on 26 March 2014
I'd agree to an extent. The fact that NSMB launched on Wii U and 3DS months apart, as opposed to years apart the previous generation, is something I think hurt Wii U right out of the gate. The similarity of the concepts in 3D World and 3D Land are another harmful factor. Wii U itself is a problem, of course. As a machine, it will never have more than niche appeal. However, failing to ensure any truly new, compelling ideas or software have hit the machine has been a huge failing of Nintendo, and that's exacerbated by them using similar concepts on 3DS for some of their biggest sellers.
