Heres my 2 cents worth:
Apple brings with it as was pointed out in the Article, a certain amount of closed hardware, which DOES make it far easier to code a game for. Look at what the Xbox is capable of with its limited set of hardware. That being said, this is somewhat attractive..
Now on to the hardware in question: This will burst the bubble some people live in that Mac's have some magical greatness about them that makes them better than a PC (I've met several people who still believe this to this day amazingly enough). the fact does remain however that there are only 3 or mac configurations that are capable of delivering reasonable game performance right at this moment. The 4850 while being dated can play most games at a reasonable FPS with "stock" settings. Obviously this will not capture the hearts of enthusiasts, but enthusiasts arent who pay the bills. Console game sales obliterate PC game sales. Nuff said on that subject.
Enter Hackintosh: Knowing how easy it is to create a hackintosh these days, it basically amounts to any Intel Core iX series cpu's w/ board and an nvidia GTX2xx series card. These bastards deliver performance that is *on a similar* level with their Windows installation on the same hw. I've personally only tested Bioshock, but the performance was similar when on OS X on this hackintosh with a GTX260 as it was on windows. (Windows won, btw.. but as another pointed out, no new drivers for OSX since June). Apple could realize that their current thought process behind their computers just isnt going to get them a win, and in order to compete with OEM PC makers and microsoft, they will need to loose their high horse mentality and start a war for regular PC hardware. Their gadgets make their money any way. Open OSX up to OEMs and support only a strict set of hardware configurations. Thus keeping the same "quality" they have now for the most part, the base standard for developers of games to go by, and open PC owners to the Apple experience by turning their PC into a Mac, legitimately, by installing software. This may get some attention, and enter them into the game for real.
That said, they'll never do it until Jobs dies or quits, as he is just to blind to see past his own pride to admit Macs arent magical with fairy dust on the inside, but just another PC with their software on it.