It is also pretty clear that if you want to play high end games on your computer, you buy a PC. I'm not sure it will be this way forever- if Mac continues to gain popularity more games will probably be released for Mac- but as it stands Mac isn't even an option for gamers like me (or any other non windows OS).
The age of PC gaming being a driving force behind sales is coming to an end though. It's just too expensive and too much of a hassle, both for developers and end-users, which is why console games are bringing in over twice as much revenue than PC games these days.
A market for enthusiast PC gamers who value the customisability they get will, of course, persist, but the mainstream is going elsewhere and moving into gaming appliances like consoles. And if somebody's got an XBox 360 or PS3 for their gaming needs, does it really matter to them how well their computer plays games?
The trend in gaming right now is working in Apple's favour, not against it and the fact that Apple does not have a place in its line-up for a customisable gaming machine is becoming increasingly irrelevant.
