Wouldn't it be cool if they gave Prot an 'Improved Spell Reflect' talent that made spells which can not be SR'd such as Dragon breaths or w/e be instead reduced in damage.
Something like "An ability that can not be Spell Reflected will instead be reduced in damage by 25%" Can't be a high number like 75% such as the DK's AMS because SR is on such a short cooldown. Can also be based off of Warrior's max HP to avoid bypassing gimmick attacks like the way the DK's AMS works.
This would give at least 2 tanks the ability to be able to effectively mitigate a massive amount of incoming spell damage, DKs are currently the only ones.