Capcom, which has been around for over 25 years, would give the Xbox 360 a large advantage over the other consoles. This would be because they would have exclusives such as Resident Evil, Devil May Cry, Mega Man, Street Fighter, along with a couple other small brands. Having Resident Evil all to themselves in Japan would definitely help out Microsoft who has never been able to break into the Japanese market well.
Capcom has shown Microsoft a good amount of support recently with the release of the zombie killing game 'Dead Rising', along with the upcoming game, 'Lost Planet'.
Rest assured Sony and Nintendo fans, Capcom would not sell out to Microsoft. If they ever did, then that would mean that the apocalypse is coming.
Nintendo fans may remember when Microsoft bought Rare, the creator of games such as the 'Banjo-Kazooie' series, along with Goldeneye, Perfect Dark, among others back in the early 2000's. But to be fair, Nintendo didn't want the company anymore, so they sold out too. Because of the fact that Microsoft owns Rare, no original games made by the company will appear on the Wii's Virtual console system, like Banjo-Kazooie.
[Update] In response to comment #6,
"Who cares. The games will all still be good, its just that MS will have access the Japanese market. Quit your winging, MS haters! You really want to change things, petition games to be developed for the Mac."Any company buying out a game developer is not good for the industry overall. Capcom currently develops for all of the consoles, but if Microsoft buys out Capcom, Resident Evil and so on will all be exclusives to the Xbox 360. If Nintendo was planning on buying Capcom, it would still be rather depressing.