As for the part about WoW's combat being older than WoW itself, I am well aware of that. However, the fact that the system predates WoW is only proving my point. No, it is not the only system a person can use to build an MMO around and frankly any MMO that clones WoW's game mechanics is doomed to die because most players have grown tired of playing the same game.
Thinking more on it if I see another MMO with a global cool down I will cry. Cheap way to discount animation times if you ask me.