"I think that the idea that the MMO crowd doesn't exist is belied by the number of players who are still in World of Warcraft"

I'm not saying the MMO crowd doesn't exist (though I do hold the opinion that trying to launch a new MMO in this day and age is a fool's errand - so, actually maybe I am saying that!). But this argument is really weak - WoW players aren't playing because they want "an MMO", they are playing because they want to play WoW. Either because they're already so deeply entrenched in it, or because they want to recapture the nostalgia of ages past (see the success of WoW Classic and various pirate servers). There is absolutely no reason to think all these WoW players have any interest in a random new and different MMO.