Plus this spec helps keep people away from us more due to the insane snares/roots that mages have, which helps with the problems we have with getting trained by cleaves. If you read what Nadagast is saying over at AJ you see that cleaves are the biggest problem he faces at high levels, which I think will still be the problem; living through that first 30 seconds of CDs is what is tough. But, since UA will be putting more damage + a silence out on dispels it may be that slows will be dispelled less often, though pally's freedom will suck still.
I don't know, there's good moves by Blizz, my advice is to get on the PTR and then give them feedback, hopefully we get another buff or two to survivability. I'm not too worried about our damage, but our survivability sucks.