Could it be a case where Nintendo's abandonment of the Wii actually hurts the Wii U? That people have "moved on"? That makes me wonder how many Wii owners have bought a PS3 or 360.
The other part, which I think is factual enough to go beyond speculation, is that a higher number of Wii owners weren't gamers to begin with and only bought one because it went viral. They played it at someone's house, bought it, then got bored with it--not because the Wii itself is boring, I'm not saying that, but because they really weren't as interested in playing videogames as they thought, or because it was only fun for them in a group setting. I'm sure most of us know people who fit that description. I know a man who bought one because he thought it would help him to lose weight but, unfortunately, he got bored of exercising with it almost immediately.
