Well there's Warhammer coming soon, Age Of Conan as well so they will take subsribers away from WoW long term.
WoW is getting old now and there's not a person I know who hasn't got a level 70. Everytime I hear friends going on about it I think 'why the hell would you want to do that' especially when they're on about going through the same instance for the 100,000th time in the hope they get something.
It has been a phenomenon mainly because it's aimed at people who like things easy. You click on a monster press a few buttons and job done. There's no diversity as such. With other games you could take on 30 monsters and depending on your skills you could drain there health, convert stamina to mana, blow them up with fireballs/acid.etc, physically dodge enemies spells and arrows, run away (with the run bit depending on your run stat so the higher it is the faster you went) and have proper diversity with no two characters being exactly the same.
I can't see the above happening again soon. Sadly I think people want a easy ride.
M.