I really doubt WoW could appear on any of the current consoles as is. The biggest reason is that there is simply way too much information contained on the screen at any given time. A second reason is that, as is, you absolutely would require a keyboard at least, keyboard/mouse ideally. That's not bad except, really, how many more people would they get by going to a console with WoW?

Now, a STARCRAFT MMO on the other hand... build it from the ground up to be more MMOFPS than RPG, and you could tailor this for both PC and console.