I’m not sure it’s a regression really
If you look at a graph of the world population it’s seems clear to me that freely available common resources are just going to continue to get overused and ruined as we continue to add people to the equation
Surely bathrooms are something we can produce faster than the rate at which population increases.
but wouldn't that also follow... more people can create and maintain more common resources?
tbh I think this falls into a more familiar pattern with a coincidentally fitting name: enshittification
no one makes money off of public toilets, so they don't exist anymore
It probably isn't as much about population growth as the increasing wealth gap. My hypothesis would be that a society where people don't feel fair distribution of wealth is more prone to this 'abuse' that you call 'overuse'.