Just doesn't sit right with me...
As it stood, the guy was being camped by those that wanted multiples.
As it will/does stand, he'll be camped by those that want multiples, and those that want just one (assuming the low drop rate is accurate)
Add to that the aforementioned being unable to kill him practically with potions...
It just doesn't feel like much of a fix, to me.
Yeah, at this point, it feels like it actually will make the situation worse.
If it had been left alone: fairly soon, everyone who wanted a shroud would have one. They wouldn't be worth anything, and therefore, not worth camping. New people who wanted a robe could get one easily (or cheaply) enough, and the quest would be easy enough to finish.
With this fix: the price for the shroud will stabilize (probably at around 500k each) -- high enough, given the still relatively small effort involved, for him to become a focus of camping. Those who need to finish the quest will be able to do so, presumably, but they would have anyway. Those who don't have shrouds will either have to pay 500k for them (easy enough for some of us, but less so for newcomers and casuals) or fight the campers at the spot which will now be perma-camped. Those who spent the better part of the last week camping the spot, on the other hand, will be rewarded for doing so by the stabilization of the shroud's price.
So yeah, this fix ain't one. If it had been left alone, it would have been self-correcting eventually, but now the problem will just be perpetuated.