I think they should keep Japan seperate because it is the most accurate data on the site. We have two weekly sales data companies to back up the number. That is the only reason Japan is seperate.
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