I would love more dynamic design for dungeon content, but the most vocal part of the community has nothing but contempt for them and would throw an unbelievable tantrum should we get anything other than what we have now. There also has to be something worth getting out of these dungeons, and the reason older ones like the thousand maws and Qarn dont get any mileage out of their extra chests and areas is because the things you get from them are useless now. If extra chests dropped something useful, like Tomes, then people would want to seek them out.