Long term I don't see how it's possible to continue to let people live in areas so fire prone that insurance cannot be done, it seems to me. Unless you want to live in a concrete castle or something
Construction itself isn't that expensive. It's certainly possible to self insure and accept that living in an area prone to fires means your house might burn down. It goes against the prevailing culture of the ever-growing housing bubble, but financialization has to hit its limits some time.
Self-insuring is probably not going to fly with your mortgage lender. If nobody can get a mortgage, and everyone has to self-insure, it's going to 1) drive down housing prices (fewer cash buyers) and 2) guarantee that only people of pretty substantial means can afford to live there (even with lower prices, most people can't come up with a cash payment for a house).
I did acknowledge it would go against housing bubble culture. It certainly wouldn't be a financially prudent way of obtaining primary shelter, but rather for vacation homes or whatnot. We're mostly talking about rural properties in the woods, right?
You mean like a brick building? like how structures were originally built? Seems like a good idea to me for house to be made of stone in high fire related areas. Obviously the cost would be astronomical.
Brick buildings don't do well with earthquakes. California also happens to sit on a major, active fault line. While it is technically possible to make a brick or stone building earthquake-proof, I would imagine it's cost prohibitive for large scale single-family housing projects. Apartment towers are already built with a multistory steel-reinforced concrete base that is built to withstand earthquakes, but it would increase costs significantly to build to the top like that.