I am guessing here but let's see here...
ATI manufactures the graphics components for Nintendo.
AIT is going to manufacture the graphics componenets for Xbox.
IBM manufactures the CPU and architecture for Nintendo.
IBM manufactures the CPU and possibly some of the architecture for PS3.
IBM is going to manufacture the CPU and possibly the architecture for Xbox2.

Question : Does IBM have the rights to use PS3 technology and GameCube for other things, possibly another competitor Xbox2 ?

Possible Outcome : IBM uses all these great technology or some amalgamation of these technology as well as their fabrication processes to manufacture a POWERPC processor for the Xbox2, which is not backward compatible to Xbox, thus informing the users that if they want to play new games, they will have to buy the new platform. Users being as they are will probably buy new platform to get the latest games, thus filling Microsoft's coffers.
Microsoft probably will buy over one of its competitors to get the games from that platform on to its own (read N...o).
Microsoft will probably sell a emulation kit with the latest Xbox2 to allow the playing of Xbox games on the new platform, ie. x86 on Apple via a daughter card ?

Microsoft's plan to segregate the PC platform for business and the Xbox platform for games will use its clout in the industry to get all Computer Games companies to move to the new platform, eliminating one major source of headache for them which is to support performance ie. games on Windows platform.
Microsoft will revamp their whole windows platform to fight against Linux by eliminating unneeded stuff such as directX, audio, video, etc. which will move to Xbox2.

Anything else ???
Though this whole thing may hinge on the fact of licensing of the technologies.
Just my 0.01 cents worth of thought. Any constructive thoughts ???