I believe I read somewhere from a blue post or something that blizz did not want any aoe as a part of any class' mandatory rotation. I believe this is why they removed fire nova from our main rotation and replaced it with a single target mechanic. Although giving new ideas is really helpful and nice with theorycrafting =]
I remember a long while back now I read an interview with someone from blizz saying they once thought of putting a totem on shaman's backs. THIS would be fantastic to see, it could help in many many ways, including pvp. I hope blizz thinks more about enhance and works with all these ideas.