I love DSA. It's fun, reasonably challenging in Vet mode, and the rewards can be nice (although more often than not they aren't). The main thing that prevents me (and many people I know) from running it more often is the time investment. A DSA run generally demands at least 1.5 hours and can take considerably longer if the group isn't experienced. This sometimes isn't feasible, and can be pretty draining.
What I would like to see is an intermission between Arena 5 and 6 (i.e. the midpoint, before Boethiah starts talking) that allows you to save your progress and resume playing (with the same group members) at a later time if you desire. This would make the time required to run DSA much more manageable, and should make DSA far more accessible to everyone; veterans and newcomers alike.