Why not just remove the ability to wear mail, leather and cloth items?
During my career as a Holy Paladin, I have always had some cloth, leather or mail armor equipped. In most cases the gear was less then optimal, which was the punishment for using it. It will now also cost 5% of our intellect to use a non-plate drop. This is also a 5% drop in spell power and mana regeneration.
With mana and heal pools skyrocketing the 5% bonus will always trump any upgrade a non-plate drop could provide.
It feels like Blizzard is trying to influence raid loot rules. Why not just put class and SPEC restrictions on all the items?
Meanwhile, my mail iLvl 277 bracers have be replaced by my old iLvl258 bracers.