Blizzard has MMORPG experience that I'm sure every developer would dream of having. Blizzard has more money, more resources, more... everything.

Plus, they displayed some doubt in the system of no auto attack and if you remember from last year's Blizzcon, less than half of the features they announced made it into the game at all. I don't see them sticking with the no auto attack, but if they do, good luck to them, I'm sure they could make it work just because they are Blizzard, they can make anything work. And if it doesn't, the life of their game doesn't hang in the balance, like FFXIV's did.