One theory in MMO’s games says : « Given the choice between similar games at similar cost, the majority of players will play the best game ».
For exemple, in 2004 the fans of Everquest claimed that World of Warcraft won out against the nearly simultaneously released EQ2 due to better marketing.
But Wow might be the standard by which they measured that new game, obviously they were willing to try something else, and would have staid if that something else had had sufficient quality.
This theory is applying a version of meritocracy to MMOs and equating a games success in the marketplace with its artistic success. On his website many people challenge him regarding the second assumption. The whole art verses popularity argument seems to me to be based too much on subjective aesthetics to be susceptible to debate.
See on for-tourisma.com