WAH WAH WAH,
mages have never and will never ever be unviable in any of their specs for either aspect of the game.
"Nerf arcane oh noes it makes it worse than fire but it's still like one of the top dps specs overall in the game, HOW DARE YOU".
There is a reason they nerfed it, as much as rogues would like everyone to think that Blizzard just nerf things because they hate them (same can be said for warriors i guess) and if for some insane reason they decide that nerfing was a bad idea, guess what, they'll BUFF you to boot