The only way Apple would become a good choice for PC gamers is if they started shipping computers that competed on price with gaming PCs while offering comparable performance.
I could easily see "casual" PC gamers (people who play games casually, not who play casual games) buying a Mac for their general purpose PC and playing games on the side, iff the Mac offered decent gaming performance (they don't) and were priced around the same as a decent gaming PC (they aren't).
It's a chicken-and-egg problem, though. Studios don't want to invest in making (or even porting) games for a non-gaming platform, gamers don't want to buy a computer they can't play games on, and Apple doesn't want to invest in pleasing a consumer segment that doesn't exist.
I could easily see "casual" PC gamers (people who play games casually, not who play casual games) buying a Mac for their general purpose PC and playing games on the side, iff the Mac offered decent gaming performance (they don't) and were priced around the same as a decent gaming PC (they aren't).
It's a chicken-and-egg problem, though. Studios don't want to invest in making (or even porting) games for a non-gaming platform, gamers don't want to buy a computer they can't play games on, and Apple doesn't want to invest in pleasing a consumer segment that doesn't exist.