for one that is bollocks if you think it isnt do you seriously think that everyone who has ever quit wow has never come back and liked the game? seriously? for one i have, i quit in early wrath and came back in cata and liked the game just as much as before and i think mists is the best expansion so far.
i also think gw2 is a good game but far from as good as wow except in pvp. i think pve wise gw2 is mediocre but its the best pvp game on the market imo.
also i said nothing about how much is on a shelf in a store. i said how much does the average person know about it? which is practically nothing. if you go on the street and ask someone what an mmo is the best odds of a game being mentioned is wow since that is the only well known mmo outside of the mmo market. the mmo market was always small and niche before wow came out wow was a freak chance that somehow became mainstream.
the mmo market as a whole is declining and its most likely going to revert to the everquest days