You know, I was in a similar situation - Ready to make fun of it, then suddenly, I was like "Ohh, okay".
It could potentially be a huge hit. This is one of those ideas that a developer sees, slaps themselves on the forehead and wonder why they never thought of that. Honestly, it's a pretty easy way for kids to control a game, and if it works out, it could potentially be a hit.
I dread phone calls asking if we "got any of that Wii Waa in stock".