the wii success is set in stone, lots of sites and lots of shows are endorsing the wii in its exercise benefits. Nintendo was thought of a kiddy game system, now an adult system as well.
Kids+adults, parents will get the wii for themselves and for their kids. I agree the wii doesn't have many "hardcore" gamer titles but the wii is getting into the homes of many different kinds of gamers, the non-gamers.