I'm not saying (as I said...) that they won't do content like Azshara.
I said they probably won't do another full-blown, boxed, retail expansion after the next one. Sheesh.
Titan is not going to take another 4-5 years and you know it. They've been working on it for a long time now and saying it's not guaranteed to succeed, while technically not a statement I can prove wrong, is also something that is highly unlikely. Blizzard are not fools - they have YET to release a piece of software that didn't destroy the market - Titan will be no different if it's truly the game to take the mantle of Flagship MMO from WoW.