Name something that would happen in the game that would for sure, 100% make you throw up your hands and say
"DONE!" and quit WoW.
as for me I honestly can't see anything Blizzard would do that would make me quit... i'm too deep in the addiction
However, if their next MMO happens to have playable tauren in it, I might quit WoW for that.. considering my tauren fetish is my biggest reason for playing WoW
...did I say that?