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There is another thread currently working its way through the Recent Threads list about what creates longevity in a game, MMORPGs in particular. I'll put a link to it HERE.
There seems to be the idea that MMORPGs should give players years of game play. I would submit that while it's possible for an MMORPG, or any game to grab a player for years, it's very much the exception, and it's not limited to MMORPGs.
Think about yourself, and the people you game with. Of the games they have played, how many games did they play for a year or more? How many of those games were MMORPGs? In my experience, the games that lasted for a year or more are very much the exception, and the games that lasted a year or more ranged from RPGs, RTSs and MMORPGs. MMORPGs do not seem to be exceptional in terms of longevity.
Is MMORPG longevity a myth?
I can not remember winning or losing a single debate on the internet.