What if a game developper or even nintendo release a game with head tracking on the wii ?
http://www.youtube.com/watch?v=Jd3-eiid-Uw awesomeness
On a side note the Wii was called "revolution" not because it was meant to be a revolution but because "revolution" is the term for the motion capting effect of the wiimote / sensorbar. A bit like the term "earth revolution" (don't know how its called in english).
End of 2008 (31 dec.) prediction :
Wii : 53.5 Million
PS3 : 24 Million
X360 : 27 Million
Prediction started January 1st 2008.