The people who gravitated to it because it was OP and could solo the pants off most quests will drop the class, sure. Most play it because they like playing a versitile healer, and will not switch simply due to some SP nerf on one end to conpensate for power creep on the other end.
And when they clearly and repeatedly demonstrated they could solo content designed for 12 people, it was only a matter of time before the class got rebalanced. Im surprised it took this long.
If running in circles backward while pushing three buttons is skilled, why does everyone hate arcane archers.
(sorry, had to)