Anyone saying that Microsoft is going to be happy with only selling well in the USA and the UK doesn't seem to know Microsoft at all. When has Microsoft ever been content with losing market-share or not being able to extend the influence of their brand? I don't believe that for one second, or else they wouldn't still be fighting in Japan and they wouldn't haven't given away FIFA for free in much of Europe. I assure you, they aren't high-fiving one another because they won a few weeks on the US and UK charts. Microsoft has never had that kind of low-scale ambition.
They've finally figured out some things from a PR perspective, though, and they're spending a lot of money, so they'll definitely put up a fight. They made a lot of mistakes, certainly, but gamers have forgiven all of the big three in the past for worse.
I'll say right now, however, that I don't believe Microsoft is changing plans much EXCEPT from a PR perspective. They were already planning to make a bunch of new games, for example. The only difference now is that they're not taking gamer interest for granted while they reach for other markets.
