I made a similar post about this a long time ago, but things have changed since.
An overwhelming trend I've noticed about the new WoW races, is that each successive race added seems to have a much more diminutive population than the previous.
In the Burning Crusade, we get hit with a storm of Draenei and Blood Elves, each of which have had their populations decimated upon introduction as playable characters. Compared to say, Humans and Orcs, they're supposed to be relatively rare. But everyone starts playing them and it seems like their numbers are pretty limitless. Now, that in itself isn't a big deal, except it gets worse.
In Cataclysm, we get Goblins and Worgen that evacuate their homes via ship, and supposedly there are only hundreds of survivors between the racial factions. The result, people play Worgen and Goblins in huge droves. They are everywhere. The lack of continuity starts to become obnoxious at this point, but it gets worse.
In Mists of Pandaria, a few Pandaren escape a giant turtle in a hot air balloon. Suddenly, all of Azeroth is crowded with floods of Pandaren adventurers.
I know. I know. The game represents a scale, and it isn't supposed to be realistic whatsoever. But isn't it starting to get kind of ridiculous?
Will the next Race be composed of a sole survivor? I'm not discounting the possibility...
Disclaimer: To all the people mentioning population balance, I am not addressing that. This post is about the Lore.Why the racial stories might need tweaked in the future for continuity.