ACA/Independence had several retirements before they closed the doors. There were a handful of captains that had come over from either AWAC and WestAir.
There will definately be more regional airline retirements in the upcoming years. Part of the reason why you haven't seen a whole bunch is because up until the industry slowed down, most regional pilots were still able to move on to the majors. Also the concept of a "feeder" airline really didn't come into very strong existance until the late 80's/early 90's so the employee groups at the regionals are no where as senior as at the major airlines.