Fine line between "budget"-setting features and "trusted-invoicer"-features.
Discussion
So lets say you rent a car. The company would take your CC and "threaten" to charge it if you return the car dirty or scratched or whatnot. With a Bitcoin wallet I could remove any allowance the minute I receive the key.
For this insurance use case, the wallet would require me to lock up funds with the company. Maybe 2-of-3 with a trusted third party. I see no other way than to involve a third party to force the client's payment.
Of course the third party could also be a respected insurance where the car company would trust to get a payment. This would allow the client to avoid locking up $10k for a car rental in exchange for paying some monthly fee for example.