Well Dragon Quest IX and Monster Hunter Tri had monthly fees for online, in Japan. But when they came over here they were free. So maybe if Dragon Quest X does come out over here it'll be F2P. We've seen what happens when a company tried to release an MMO over in the west with a fee (see The Old Republic; also known as TORtanic)
I'm not fond of the new direction Square Enix has taken Dragon Quest.