Soundwave on 27 January 2014
I would say specifically the failure of Nintendo Land (using the mini-game formula popularized on the Wii), Wii Sports Club, Wii Party U, Mario & Sonic, and Wii Fit U to propel Wii U sales even to a reasonable level indicate the Wii was basically a fad.
These games are going to go from being massive system sellers on the Wii and some of the main touchstone games, to games that can barely move 2-3 million WW on their own in some cases and can't sustain the Wii U to really pathetic Dreamcast level sales.
Brain Training and Nintendogs on the DS have also suffered monstrous drop offs.
