So much of WoW is like an abandoned ghost town, it doesn't make sense to follow in its footsteps.
Because leveling via dungeons is faster than overland questing.

New Draenor is empty as well, mostly because the game has you sequestered into your garrison for most of it. The game drastically turned into a facebook game and it's ridiculous.

And I don't know about you, but in a game where leveling alts is possible, after about the 20th I don't want to do it anymore. I've purchased a grand total of 1 level 90. EQ2 even did it first, and they're cheaper! A LOT cheaper. But everyone blames WoW for starting it.-_-