At the very least, having your inheritance planning for your BTC should act as its own type of insurance. Not sure if a monthly buy-in model would actually make sense in BTC terms.
Yes, that's very true. It's easier in a way since, well, if you're not an idiot, the state doesn't get involved. Why would it not? If you have enough scale of adoption, I think it could work, at least as long as not all your policy holders die off at once.