I think what we've shed are more things like chairing a committee for the VFW, selling snacks at little league games, or being active in a lowers voice, looks over shoulder union. These are things that would traditionally take up the social slack left by not punching a clock every day, and we've eliminated them systematically to make room for more marketized activities. Today's retirees are "richer" than their parents were, so they can take cruises, travel, pursue expensive hobbies, etc. but they largely don't have a social context to make those things satisfying, and there are fewer grandkids to take care of than ever.

In what way have we "eliminated them systematically"? Maybe I haven't paid close enough attention, but it feels like those activities have (unfortunately) disappeared largely naturally.