The pet walling needs to be completely nullified. Magicians are the only class people can mass box to kill raid content though without them using obvious scripts to play their characters. Instead of that minor nerf they did last patch to pets, they needed to literally axe it by using either significantly increased mana costs, allowing the stacks to increase per every pet summoned, or having raid mobs ignore pets altogether and go for the caster if nobody else is on agro.
I heard a rumor though that they can't do the PoW pet code as the entire zone needed to be reworked just to allow that code to function.