One thing I've been thinking about is that since: http://www.wowhead.com/quest=33337 this questline basically exists for lore purposes, once WoD launches, could this questline become a FoS and taken out?
It doesn't award any achievement for finishing the whole thing right now, but since Kairoz is involved with freeing Garrosh, I think there's a relatively reasonable chance they make having completed it prior to WoD a feat of strength.