While the grounding of a/c does impact manning, let's not forget about the mandatory retirement age just changed to 65 just under 4 months ago.
Also, at UPS/FedEx, they had a bunch of ROPES/Clingons/Herpes (over 60 years old pilot-type) flight engineers, that now get to go back to their Captain's seats, per the new legislation (employed as a required cockpit crewmember when the law changed).
FWIW