this is just 1 more step for the mac to be the prominent gaming computer
Been using Macs since System 7. I'm doubtful that MacOSX will ever become a 'prominent' gaming platform.
However....
The so-called trickle-down effect from the success of the iOS devices means that some game developers (who are often surprised to see that they are becoming overnight millionaires by their success in selling iOS games) may give MacOSX a serious consideration.
Mac gaming.... been there, done that in the 1990s. Bungie and Marathon and Myth. That was also the era of MacPlay (InterPlay's huge Mac division) selling tons of Mac titles in retail stores like Fry's and CompUSA.
That was also the era when then-blockbuster multimedia eye-candy game Myst was a Mac-first game, to the jealousy of many PC gamers. A crapload of Mac shareware games companies thrived in those days... like Ambrosia and Delta Tao. Ambrosia's still around, but they don't seem to care about making Mac games any more. Parsoft and GraphSim in that era gave us top-notch Mac flight sims, on par with their PC counterparts. Hell, even Microsoft sold a Mac version of Flight Simulator 4.0 (early 90s). And then we had Maxis as well as Blizzard, in those days they were very Mac friendly companies who developed games simultaneously for MacOS and Windows.
Adddendum: and of course, in those days, small Japanese company LittleWing developed the BEST Mac-first (Windows-later) realistic physics pinball games ever. And much to my surprise, LittleWing still exists, and their online website still selling (direct download purchase only) their gorgeous pinball games, some of which are updated to be compatible with the latest versions of OSX.
http://www.littlewingpinball.com/doc/en/index.html