Im sure they could make it work. I know the PvP souls in Rift were crappy on their own. Like I mentioned they were mostly just reductions to CC/Stuns, usually a trinket ability to free yourself. An on use ability to reduce incoming damage. Passives to increase and decrease damage to players. It would totally remove the need for resilience in WoW. Everyone would be happy. PvP no longer would be about who botted for 24x7 to get all their gear in a week or paid for a carry to buy the best rated gear. It would bring skill back. Everyone would be in BGs on equal footing because their skill and talent choices would determine how they did not their gear