You know, I could care less about this than what I think MOST players would really really love..
The ability to change your RACE.
I know waaaay too many people who started and leveled a race they just arent happy with anymore who would be more active if they could use a character they prefer.
For example, I have a level 72 Tauren hunter that I would love to level except that honestly, I'm TIRED of Tauren. Tauren were cool when I first started the game so many years ago, but now I hate him... I hate how big they are, how they take up so much screen space, how navigating hallways is such a pain in the butt, and their hit box might as well have a "slay me first" sign on it. Being able to switch to a Blood Elf would reinvigorate the class for me. Same goes for my Mage Troll