It would help if they removed the lower difficulties and drastically increased the power world mobs had in comparison to the player from what it is now. The main source of friction in wow comes from the massive skill difference in its players. To my knowledge no other game allows itself to be as mindlessly easy as wow at level cap.
If you raise the skill floor you will see people slowly start to trust one another more as the players who kick protection was implemented for are slowly driven off to face book games were they belong. It seems cruel but everyone would be happier with that.