With the low system requirements of WOW it would be pointless to put it on Xbox. Not to mention the fact there would be severe macro limitations, just imagine a shapeshifting druid and being limited to the amount of buttons you have on a controller.
There aren't many games outside of RTS/MMOs that aren't already ported to consoles now anyways. It seems gaming has gone the way of the console pretty much, but for FPS type games I will ALWAYS prefer a decent pc over a console any day.
I did always want to see Metal gear on Xbox 360. Its one of the reasons I sold mine and bought a PS3, and the funny thing is I still have yet to play it, lol.