> Now imagine we have a test, that can predict it with certainty. Very soon only those with positive results will want insurance. The insurance against it will become unprofitable and discontinued.
That does leave a time when the risk is still insurable: before the test is conducted.
One can imagine it evolving as an additional service that the testing provider may partner with insurance companies to provide. At the time you buy the test, they say "if you pay an extra $X now, you get insurance against us finding anything catastrophic."
(Just idly speculating here, who knows how these things will play out in a combination of regulatory, market, and technology changes.)
But since your parents had the test, and they know your parents' results, your probability of having the (genetic) disease is not exactly unknowable by the insurance company.
You'd have to prove that you didn't already have the test performed, which sounds tough. For example, maybe you flew to Elbonia to get an illicit test done in some dark alley, then came back to the US and retook the test while buying the insurance.
That does leave a time when the risk is still insurable: before the test is conducted.
One can imagine it evolving as an additional service that the testing provider may partner with insurance companies to provide. At the time you buy the test, they say "if you pay an extra $X now, you get insurance against us finding anything catastrophic."
(Just idly speculating here, who knows how these things will play out in a combination of regulatory, market, and technology changes.)