Is it possible yes, you probably right, but the time someone figure it out how (I mean a party setup with each class in the group), ppl will get bored of doing the dungeon or a new one has been released. Actually, i'm bored of dungeon, we doing speed run with blm x3~4, war, whm x2, and i don't think we would come back to the "first try" of the dungeon with another setup, i had enough of the news dungeons, i wan't the reward now, that's the only thing that keep me doing it.