I think that Endless Ocean will be a slow steady seller for a really long time... kinda like cooking mama, but to as much. I see it do 3-5k a week for a really long time.
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