To be honest though, how many Enhance shaman do you see in arena teams? It's true that it's a bad thing for Resto shaman to have, as they should be making a conscious decision on what to spend mana and GCD's on (healing or purging) so they shouldn't be getting double the effect. However, you still have to keep in mind that the DPS specs will suffer greatly from this change, and we've been nerfed enough because Resto is 'too strong'.