I think the devs are trying to make monks tougher in PvP.
When would you be able to use Kukan-Do on a worthwhile monster in PvE?
Will that monster even be stunnable?
Does anyone have the time to generate that much ki to stun them from a distance while in a quest?
Most monks melee so I can only see this ability as something that will work like this:
Monks sit on ledge, gathering ki... Hop down, stun you, run up and begin beating on you. PvP.
My suggestion is to add things people won't complain about but they'll actually use in PvE.