>Like we see in California, when the government sets a price ceiling, insurance companies just leave

Does not answer the question. With no price caps, no one will be able to buy insurance even if required by law. So that means if you own a house in a risky area, you will be unable to sell it and your values will fall. The price caps are to prevent that. But to me, there should be big incentives to prevent building and re-building in risky areas.

So yes, the world in some areas are uninsurable. And other areas are becoming uninsurable.