Yeah, unless Wii U proves to be a disruptor, it just can't compete with the wii.
It was a freaking worldwide fad. I remember attending to Video Games Live Concert in september 2006 not even knowing what was a Wii. I got there and there was a colossal line to shake that wiimote in tennis. Seriously, you got to play literally 30 seconds and there was a giant line. A lot of people missed some songs in the concert just to feel the thing