Pardon me if this has already been said... but couldn't a Mac user still run it with a Windows emulator? Something like Parallels?
(Similar to what most of us Linux geeks have to do with either emulating or porting...)
EDIT: Or as I just scrolled and saw somebody mention Boot Camp... indeed.
On a side note...
^ I love this, and seriously too. Love the fact it points out that there are still several, almost just as many, that use WinXP as there are Win7 users. Which I still find ironically funny that MS refuses to support XP anymore, nor allow XP to have DX10 support. I mean, even myself, a hardcore geek, I dual-boot Windows XP and Ubuntu/Linux. I even had Vista at one point, and purposely wiped it out and reformatted with the soul purpose of going back to WinXP.