Still in WAR at the moment, but if I did leave it absolutely would not be to go back to WoW. WoW had its time, theres really no way I would go back to it now, it simply does not have anything in it that has any appeal for the kind of MMO I like.
I think a lot of people will go to WoW when WoTLK comes out though, how long they will remain once they go back though I dont know.
Sadly, WAR will be my final MMO. Frankly MMOs these days are simply utter crap compared to the golden era of UO, AC and early Daoc. MMOs today just dont have the magic of those for me, today its all too easy, too solo orientated and too unsocial. They are virtually single player orpgs these days.
When I have finished with WAR, I will return to LAN gaming and things like Fallout 3 and Empire Total War Etc.