I don't know if they look so far ahead? Ie if insurance is just for a few years at a time at once?

There's a paper that proposes long term property insurance, which makes it seem the one year contract is the standard? http://opim.wharton.upenn.edu/risk/library/J2010(JIR)_DJ,HK,...

Ahh. That makes sense. So insurance is more interested in the potential for a claim within the current policy cycle and not the long term risk.

That, and in some cases highly-correlated risks get dismissed altogether.

If your neighborhood floods, that's a bunch of insurance claims, but if your city floods, that's potentially a bailout, bankruptcy, or contract exemption for the insurer. (In some cases, like sea level rise in Florida, there's already an understanding that the state is subsidizing insurance that wouldn't be available otherwise.)

So I could definitely imagine some value for a buyer-focused service that carries information about all known risk, not just covered/unsubsidized risk.

Kinda. It is why the state of Florida subsidizes homeowner’s insurnace policies.

Otherwise, because of future known risks, it would be untenable.

Also, many formerly vacant parcels of land known to be in the likely paths of hurricanes, have become subdivisions.

I guess that is why flood insurance is a separate and optional policy?