I really wish that i would have decided long ago to go for exalted defilers instead of finishing WSG, at least then i would have an awesome tabard to keep me going. I have definitely slowed down on my AB rep farming, but it does remain one of the last things i would like to finish before i stop playing.
Also, for anyone who didn't know, the quests that were once attached to Arathi Basin (with the last quest being required in order to earn your tabard) are no longer in the game. :-(
You just buy the tabard for honor once you reach exalted.