First and foremost: this is not a thread about whether WoD should have flying or not.
Over the past few months, there were numerous people stating they will unsub/will not buy WoD at all, if there is no flying in it.
But why would you completely diverge from a game, for such a little aspect? Is the core reason you play this game, because of flying on a mount?
PVP, raids, quests, achievements, social interactions, collecting pets, leveling alts.... Is that all just "filler content"?
I'm intrigued to hear one's motives.