^I do not think many core gamers were planning on going Wii only.. For core gamers the Wii is a second console to begin with, again, won't hurt the Wii, but will help HD consoles.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut