Well I think if the game ends up doing well it is not going to be due in any major part to the existing gamer population. Most people I know don't seem interested in shaking the wiimote to music and think Boogie is pretty copycat on Rockband and Guiter Hero etc...
But I can see how girls would get into this game and I can see how it would be fun to have people over and make an ass of themselves on your Wii in new ways =P