Just a random thought, but how many years was it between WoW expansions. How long did it take for Burning Crusade to come out after WoW was first launched? Different game I know but perhaps this might gauge how long we need to wait before they put any new real content in like 2.0 and hopefully more story.
The industry, and the potential market, has changed drastically since then. It's irrelevant what the time frames were back then.