Well BB has spent 2 weeks after release in the top 10. And since it spent at least 2 weeks prior to release in the top 10 we can say it's become a fixture up there. 1 month baby.
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