No doubt, keeping existing stuff, guns, cars, homes etc, working will be important. I bet most people you know can’t do any of those things. At least that is true for me. For most folks “self reliance” = Yellow Pages.
Most people think light bulbs grow on bushes next to the tulips.
The rich guys in the future might not be the lawyers and bankers.
It’ll be the guy who controls the access road to the dump!
The guy who knows how to hook up an alternator from a broke down Saab to a lawnmower engine and get a couple hundred watts of 110V out of it!