Traditionally when Delta is hiring, the CRJ side see's the most attrition, but with Delta not having done any significant hiring in years, when they do open their school house it should be interesting. The extended time most have spent in the left seat has provided a comfort level that is hard to leave, I wouldn't be surprised if the majority of Captains elect to remain at the regionals. Going off of flightdeck polling, I hear more often than not that either they can't afford the pay cut, they're too old, don't want to go back to reserve, or don't want to give up the QOL (weekends, holidays, vacation, etc). I would put the bar at about 10 years, if they have been here longer than that, they aren't going anywhere , below that is where the attrition will happen. Of course, I could be totally wrong, wouldn't be the first time.