If past patterns continue, I'll wait for the micro transactions to ramp so high people get outraged, items get nerfed/pumped/micro'd. Blizzard milk the whales for a bit. When they can't get much more out of the whales they say "we are sorry, we fixed it and removed most micro's" . (And keep the money)
Then it will be the "regular player" cycle of expansions and a more polished game.
So maybe 1-2 years time?