Ultralights...
The question of wether retaining operational ejector seats in warbirds is not a simple one. By virtue of the design of the earlier systems they really warrant extensive training in their operation and the risk of their use as a lifesaver versus inadvertent or incorrect use becomes highly debatable.
For those who would argue that that any shot at ejection is better than no shot, there was a large hangar in Somalia with several fighter aircraft stored there after being abandoned in the mayhem. A war journo thought it would be an adventure to check out the cockpit on one. Shortly after the hangar had a neat hole in the roof and the war was down one journo.