So, I just tried fistweaving on a training dummy on live and on ptr. My damage is about five times higher on ptr than on live, thanks to onehand buff and muscle memory. It might be even higher, since instead of doing nothing and just autoattacking when your buffs are up and there is no greater raid damage, you will be tiger palming.
Just some numbers: Tiger Palm and BK do about 80k noncrit with musclememory, jab does 7k, autoattacking 12k average noncrit.
[Edit just for comparison]On live my tp does 12k noncrit, BK 24k, jab 5k and autoattacking avg 10k[/edit]
In raids on live I am doing about 20-25k dps, usually competing with the tanks for the lower end of damage recount, if this would go live as it is on PTR that would mean I would be doing about 100k dps (but again, it's hard to actually calculate the raid buffed scaling from a target dummy test).
If the healing still is as high as on live (or maybe even buffed - this is quite hard to test on a training dummy), this would have a drastical impact especially on 10 player raiding, where fistweavers could significantly contribute to raid damage requirements, benching - depending on the fight - pure healers or pure damagedealers.
I really cannot imagine this will go live as it is right now.