Hex and 20% damage glyph

Anyone think that with the 20% damage glyph (morphed mob takes 20% damage before Hex is removed) that it might actually be useful to put Hex in a spell rotation? I figure that lowering damage to the tank and less mana use from the priest might help out.

However, I don't know if Hex resets threat or increases threat to the shaman too much...probably does.

Anyway, was just thinking about this as I was reading the 3.1 changes.

Ive used hex alot in UK/Gundrak due to beeing undergeard, alot of boxers laughed of me when i hexxed but i did 4 heroics without beeing critt immune on my tank and the only item i ever bought for him was the epic tanking helm!

I dont see the point in trowing it into the rotation when you can just hex in the start and tank away, concentration doesnt break hex from what ive experienced!