I don't think that is the business model: there will be a small percentage of people able to afford these, which will have transponders and 'priority rescue' status from emergency services, as part of the subscription package.

Yes, sure. But even that wouldn’t work - those people still need to have advanced warning and be close to a capsule. But if you’re close to a capsule, then you’re likely close to home and you can just build a flood safe room in your house.