I think it would be too close to Gravity personally.

If my target dies mid cast, I don't get my GCD cancelled. Having to shuffle and dance around under big mob packs is a fair price to pay for this and helps keep things interesting IMO.

Gravity is safer due to being able to be used without standing under the pack, but can be pretty annoying in especially wimpy trash packs where AoEs with a focused hit on a specific mob can KO some mobs much sooner than others.