What's so insane about 30 million? It will take a long time, but the Wii will be selling for long enough, enough new wii owners will pick it up to eventually reach that mark.
Does thirty million seem too high for MKWii? That's at 19.3 million after less than two years! I see Mario 5 outdoing MKWii.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.