Nintendo has completely forgone the 18 to 24 year-old male demographic. They're trying to tap unseen, non-traditional gamers when trying to achieve market dominance.
It's a fact that most women do not enjoy gaming, PS3's, or 360's. Toss em something like this and they'll get on it. I can't wait for hardcore Wii fanboys to cry when titles like WiiFit keep coming down the pipeline.