This is a perfect example of what makes history fascinating - its ability to make sense of the present and the future.
His conclusion, for those who can't get through it: housing is a dead end investment. It's a liability, not an asset in economic terms because it discourages mobility and doesn't have good (any?) returns. We should abolish policies that promote each man his own home, encourage renting, and come up with housing infrastructure solutions that are economically stimulating (in terms of mobilizing the workforce and bringing talent together).
The housing market seems ripe for technological innovation. Any ideas?