Mob tagging is such an outdated concept and promotes people actually running from eachother because they don't want the other to tag their mobs instead of working together and both getting rewards.
Do you think WoW would benefit if mobs were no longer taggable and everyone who helped kill a mob would get credit, either the same as if they killed the mob alone or even if a bit less then they'd get if they did it alone? Do you like mob tagging or would you rather have people work together to kill mobs and all getting rewards based on participation, kind of like in Rift rifts or GW2?