Obviously you haven't read through the other 1718 posts. You call yourself a dedicated Macrumors patron!

Honestly have you ever tried using a standard desktop on even a moderately new TV? Anything short of a HD TV looks like complete crap. Seriously. The only time I've ever hooked up my laptop to a TV was to watch DIVX movies. Otherwise dealing with the OS in whatever resolution standard TV's use (I do know its below 640 x 480) is almost painful.
Until HDTV is pervasive I honestly don't see Apple jumping on the media center bandwagon. Apple is all about the experience and by and large anything less then an 1080i TV is not going to meet with Apple, and more importantly Steve's, idea of a good experience.