Let's be honest, this suggestion isn't that bad. I think priests could use some kind of crowd control similar to a root.
It's the melee that's slicing our asses, it's not casters. It's also melee that would be affected by a cc similar to root.
We got an aoe fear with a 30 second cooldown. Trinket that and we got nothing else for 30seconds, or 26 with talents. Every class out there is able to kill a priest in 26 seconds, even warlocks.