I really dont see why not, I understand "blizzlike", but cmon if blizz had the xmog idea before cata I bet you 10482347923 gazzilion interstelar dollars they would had put it in place, its their best feature that has 0 drawbacks.
The previous guys mentions how everyone runs around like a clone, and its sadly true, at end game, all gear looks alike and we're nothing but clones in the end, this is why I find xmog revolutionary.
I honestly can say that as soon as a wotlk server that is 1x, progressive, and decently scripted and has xmog, I will jump into that one, its just so damn good, its only a visual thing it has 0 impact in the game, except maybe economy, which imho would only help to the gold sink (since it will mostly be a late game affordable feature anyway, having low lvl items cost absurd cash for new players won't really matter).
I am really tired of hearing "it wasn't in that patch so no way", well to that I say, blizz can't predict the future.
Also don't bark with the "DOOM" arguements that if we allow this one to slip by, somehow we'll end up with garrisons from wod in wotlk, no, this is totally different a very simple feature that is ONLY BENEFICIAL to the health of the game and makes you like your character more and dedicate more time to customize it to your desire.