Blood Elf NPCs say this all the time, but how do they know? Are they just saying that to try to give us enough hope to finish the task they just gave us? Or do they actually foresee an end to the evils that we fight on a daily basis?
With 11.5 million subscribers, WoW is going to be around for a long time. Even if 8.5 million people leave for whatever reason, there will still be 3 million people left -- which is great for a pay-to-play MMO. But someday it will end and when it does, it would be wonderful if Blizzard provided us with a playable end of the world.
We discussed this a couple of years ago, but WoW has changed since then. We now have new possibilities for world-ending events and there will be more expansions and major content patches giving us even more paths to complete. But will the stories end and how would you want them to?