In Serpent stance, our attacks are determined by our spell power. The more spell power we have, the more attack power we have. I'm at 242 spell power right now. Multiply that by two for the stance, and I'm at 484. So they'd have to totally change the sp*2 + (atkp*0)=attack power idea for the stance, and add it as a passive for mistweaver.
But if they do that, then what about vengeance stacking for brewmasters. Suddenly, we have a brewmaster with 200k attack power in serpent stance, doing healing out the wazhoo as well, until he has to go back and tank. Because you keep your vengeance, no matter what stance you're in.
How I picture the Wise Serpent stance for WW and BrM is
1. Only grants 20% bonus healing and Eminence.
2. Allows the use of Soothing Mists, now a baseline ability, so we finally all have a reliable, non-cooldown targeted heal.
3. Still energy instead of mana. Soothing Mists would be a stronger alternative to Healing Spheres, but since it's channeled, would still be balanced in PvP.
Then the developers can make most of the extra Mistweaver-specific perks to the stance isntead become passives / thrown onto existing passives.
For example, Mistweavers always have mana, no need to be in Wise Serpent. This would remove the cheap healing sphere use of Fierce Tiger for MW monks that already exists, so another benefit would need to be given to MW monks to use Fierce Tiger.
Same would work for Sturdy Ox - Only 25% damage reduction as well as the base Stagger effect would be part of the stance. All other effects for Brewmaster monks, like the 20% health, would become passives.
Our stances have so many effects and text at the moment since the developers didn't want to make all of that passives for some reason. It has ended up making us less of a hybrid class.
-however- it is important that WW and MW get increased threat generation from Sturdy Ox. BrM doesn't need the increased threat generation since it's all in their abilities.