Ever heard of trapped in its legacy?
This is Rocksteady's predicament. They will never released another Arkham City, and I don't want them to try. This is the problem Zelda faced, and one I think Mario is in right now. Releasing one of the greatest games of all time is the worst thing to ever happen to your studio.
I disagree, Rocksteady made Batman games relevant. That's something that nobody has ever been able to do in over 30 years. It may always be held up to Arkham city but with new hardware and some great developers I think it will still be a amazing game.