FF14: ARR! World class MMOs? Must be Free to play, League of Legends! enough said .
WoW is the only MMO that can live healthy on sub base that can hold 5mils subs for years never drop that mark. and it'll stay that way.
Im sure ARR will pass ff11 on subs numbers, but need like 100-200%+ (1mil-2mil) stayble within a year if not ARR will be force to Free to play.
A nice mmo like ARR that have 1mil-2mil stayble subs can go long way, if that ever happen 1mil-2mils can grow 2-3 times in subs in 2-3 years. but for that to happen looking at % is only at 35% that will happen.
as for WoW have what % subs in the MMO market , they should be in the 50%+ to the whole mmo market sub base, if only can steal 25% out of them.