Do you even know maybe why are they "AFK" in the back? Maybe you play mage so it's not good for you...
Remove mages blizzard from game and let's see if they are going to be AFK in the back.
Me, as melee dps, can't do anything there, why would I even go there getting instant dead by 5+ mages doing blizzard spam?
Mages are the problem for that, wait for TBC expansion and it will get better.
People who says it should be bannable are 100% mages, being in the back not means we are AFK, we just dont want to get there and get killed by blizzard spam and give FREE HK's to enemies.
If you want to remove this problem, then remove mages blizzard and problem solved, every AV match blizzard spam, that's all.
Forgot to mention that AoE is bugged, even when you get out of AoE range you get hit by that.