From mobile life, major immediate problems encountered:
- staying warm and healthy
- moving around; fuel
- clean water, staying clean
These are major, major problems. If you've lived in a campervan for any amount of time, lived in a swat, a yacht or on the street you'd know it. Desalination is too inefficient. Carrying the water in a squat is the biggest chore. Bums are usually dirty.
Electric is less of a problem these days.
Other stuff beyond this is more interesting - can anyone locally remember how to be a blacksmith or carpenter? That kind of thing. But you can muddle through it because it's not an immediate problem that's killing you. The water, warmth, fuel thing is the big problem.
Maybe it's not so far fetched either. There's a war breaking out over fuel right now on the edge of Europe.
Main things I think to learn are how to stay warm without heating and how to clean water.
Most of the professions are surely going to go out of the window-irrelevant. Would hobbiests come to the fore or is that disillusion dreaming?
Poor people are going to be best suited to this. Anyone who knows how to sew their own socks. So to that matter then the less professionally successful then could that be a good thing? It's difficult to simulate, we'd have to look to history. If someone is successful in a company environment then there's an advantage there to organise people - no change there?