To me, SSBB will define how 'hardcore' versus how 'casual' the Wii really is. SSBB somewhat requires you to be good at it, and a casual probably isn't going to like that. Hardcore like to work at their games, to become as good as they can get. Casuals like to enjoy their games more. Which is why Nintendogs with petting and grooming sell well to the 'less aggressive' :) population, as well as Animal Crossing games. Ones that fall a bit in the middle are the turned based games, like RPGs.
Strangely enough, WiiSports also straddles both categories, allowing for you to work at it to get better, or just to play around and have fun.
If the casuals become >>> than the hardcore as Wii owners, games sales will reflect that, naturally. Which will boost some games to higher than SSBB than one would suspect as of now.
Torturing the numbers. Hear them scream.
