Dude, Emps are already hard enough to break. Maybe you haven't noticed, because most of the WoE guilds don't know how to defend to save their lives, but making the Emp even harder to break is going to make impossible defenses even more impossible. Be thankful certain guilds are simply short on members, or you'd have faced one by now.
Also, if the Emp is Holy Prop, everyone is going to beg for cursed water to work, and that's NOT RIGHT. NOT RIGHT IN ANY WAY. BAD. BAD AND WROOOOOOOOONG.
Having the Emp weak to fire currently also makes Profs and Sages more valuable, and come on, they need to be cut some slack. Taking WoE roles away from them is the last thing we need.