Show me a company that can sell a less advanced 1960s style house for the average worker's median income and I'll show you the next 100-billion dollar company.
Perhaps housing is important enough to see the people do that. But even if you could somehow faithfully recreate the entire supply chain, the house won't be up to code. That 100-billion dollar company is going to spend all that money in the courts. Why bother?
Okay, sure, if the people can come together to recreate the supply chain they can also change the code. But then who actually wants to live in a 1960s home? Even the homes actually built in 1960 that are still standing, which is generally going to be those that were built to a higher standard, have been upgraded to modern standards, at significant cost, over the years because nobody actually wants to subject themselves to the 1960s.
And even if you could build the perfectly equivalent house with modern supplies and people actually wanted to live in them, there is still that pesky labour cost, which is a significant portion of the building cost. Yes, the median income of a full-time male in 1960 is almost exactly the same as the median income of a full-time male today, but the median income of the population at large doesn't tell the story of those building houses. Someone who would have worked on a job site in the 1960s is more likely to work in something like a restaurant today. As a result, of those who still are willing to build houses, you have to pay a lot more to get them to show up. "The trades are where the money is now" may have become somewhat of a meme, but there is also a kernel of truth to it.
Now, a business that can make modern houses less valuable will be on to something. That's a 100-billion dollar company. But also a hard problem to solve.