FF 16 is being made by the guys that made FF14 into one of the best MMOs out there, I doubt it will fail. If people did not find DMC fun it wouldn't sell. Most adult indie turn based rpgs are dull and boring in the combat, just like a lot of 3d adult games. As long as the devs put in the time and effort to make the combat as good and enjoyable as the adult scenes it will be a great game.