As opposed to what, becoming a niche game that can still hold value with current and future players as it ages?
...Really, what's wrong with aiming for a smaller/more niche audience in a MMO? I've felt like I've said this too many times, but please, please developers, get rid of the mindset that the word "massive" in MMO is supposed to refer to the number of players that's supposed to be playing your game. Let it instead define the kind of experience the player may have, or the size of the world, the amount of social interaction, or god forbid the level of depth within the game!
Stop playing the "grab the most people" game, and as a result past MMO players might once again take the genre seriously enough to revisit it.