Druids are absolutely not overpowered. They have a few strong points and weak points both, reclaim to escape stunfests, wagg, sub par curing until legend cloud, para for disabling, and resists.
Really what needs to be done is figure out if shaman are supposed to be primarily damage or cures, and then make them primarily one OR the other. Right now shaman out damage druids, AND heal on par with clerics.
If anything debuff the shaman from doing so much healing, make them on par with druids in that aspect, and buff druids damage a bit too, that will make healers more popular again maybe. And perhaps druids...
I dont know if other clans noticed this trend, but everyone i know and their mother has a shaman. I hands down helped over 15 shaman reach legend this wipe, and maybe like 2 clerics, 3 druids, mind you shaman spells are much easier to comeby