simple. UBI said they would make an exclusive game for switch if they could get their hands on the Mario IP. Nintendo probably required they be allowed to do some QA on the game. A deal was struck. Nintendo is getting an exclusive pretty much only at the cost of letting someone else use their IP.
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







