About dungeons, they don't necessary need a whole new game. The problem is there is nothing unexpected : always the same run one the same map. Unfortunatly, the idea I have : random generated map for dungeons (not true random, some kind of preset) is probably not possible with the current core of the game thought both servers and games stations are capable to handle such feature.

They could add some secret treasure, secret room... there are possibility. The problem is rush. People rush. Maybe some kind of unexpected random would provide them a little motivation to go a bit slower and take the time to study their environment. But it needs to be fun and/or interresting.