raiding shouldn't be the only reason for fatigue to set in, it can also just be the game itself gets boring.

i.e. if you leave for 6 months, as people often do, and come back, it's a new game. everything's exciting, etc.

until the suck returns, and you realise the bits you enjoyed have been removed, there's even more treadmills, your player class has been neutered, and the things you used to enjoy, are now fond memories of a time when you weren't panicking about scheduled fights and the same people day in and day out.

but, there's always the next patch. or the next $50 expansion.

who knows. you might enjoy seeing the Demon TV set or the 'shoot me now' circles as a warlock, to offset losing all that made playing a warlock fun to begin with. i imagine warriors get peeved about being replaced by paladins and shaman as tanks in raid instances too, and it's now all fair in the generification of wow 3.x.x class roles.

after all, one can enjoy WoW's progressive changes like one enjoys falling onto bricks or pavement. or broken glass. because, ultimately that's what makes MMO's fun, pain. lots and lots of pain.