You can build livable domiciles for a few grand in bulk, recycle waste via composting to reduce infrastructure needs, shared batteries and solar, etc. There are plenty of people on youtube demonstrating the permie off grid lifestyle. Grains are cheap and we have a wild boar and deer problem in a lot of the country so food wouldn't be too expensive either.
It doesn't matter if its cheap, the economy requires monetary exchange. What work are people doing that would balance out the work to build composting systems, infrastructure needs, batteries, solar, wheat, 'wild boar' (protip, there isnt enough without farming, I hunt). All of these things you've stated require a long chain of manufacturing, none of which are free. The systems themselves are incredibly complex and require hard human work.
Can you explain to me how any of this is possible under the constraints you've made. I can only see regression not an evolution or an improvement.
Most people don't want to live like that. They want AC, central plumbing, trendy food, and cheap clothing.