This time 5 years ago Batman had a whole organization and now the concept can't accomidate Cass, Harper and Duke?
If you assume that Dick is always going to be doing his own thing, Jason will always lead some version of The Outsiders and that Tim will always lead some version of Young Justice (whether its called that or not), its not that hard to define roles for Batman's remaining assistants.
The dectective, the hacker, the gadget maker and the fighter.
Each of the remaining birds that aren't in their own books should would specialize.
I'd also like to point out that all of the damage done to Tim Drake's character was done when he had his own series. If anything, rebooting Tim to his starting point (when he had Parents to answer to and went to school like a normal kid) would be a vast improvement.