Blizzard made $1.2 billions last year and $750 millions in 2006, almost entirely from World of Warcraft. So that's $2 billions + Revenue from 2005 and 2004 (which should add another $billion).
For Wii Fit to even reach $3 billions in revenue it would need to sell 33.5 millions copies at $90 price point.
WoW is still increasing it's costumer base (right now it's at 10.7 millions), and will keep printing money for several years more.
And profits-wise, it's not even comparable. WoW reported over $500 millions in pure profits last year. They don't need to pay publishers or retailers to get their money straight from the gamers.







