I think it would be helpful if you could be registered for DF while in a party. That way you aren't forced to solo for the hour (or longer) that it takes for a group to finally pop up. I've only had to queue up as a DD a handful of times, and I felt I was being punished during the wait time by not being able to get decent exp whilst waiting due to the party restriction (even having the bird out cancels DF...although I hear this should eventually be changing).

I do think it's important for people to go through dungeons to help learn their jobs, but the wait times are a huge turn off. Hopefully the tweaks they are making will take care of this.