I think in Japan you can compare Wii Fit quite well with Wii Sports which was released one year earlier. Wii Sports hit 2.7 million by the end of 2007, and Wii Fit is currently tracking 40 % higer than Wii Sports, so it can probably hit 3.5 million by the end of 2008 -- when Nintendo are going to release their next ubercasual title. I wonder if Miyamoto made Wii Music big enough to fill those footprints or if they have something else up their sleeves?
Hardcore gaming is a bubble economy blown up by Microsoft's
$7 $6 billion losses.