GTA4 will throw a kink in the drive for 50%... WiiFit should keep the Wii from losing any ground... I think as long as the remains hot most of the progess will be made June-Aug... then Nintendo will pull back supply, and it could actually make 50% over the Holidays(I think the Wii will have 3-4 weeks with sales OVER 1 million, with peak week making a run a 2 million)
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