A vehicle won't be 100% autonomous, and least not for the foreseeable future. Meaning, there's still a steering wheel and peddles for human interaction. So until those are removed, expect to still pay insurance for the vehicle. Even still, you have other natural disasters that can total a vehicle while parked, hail, floords, landslides, theft...etc.
Most like these newer vehicles that employ autonomous driving will allow for auto insurance at a reduced rate for the owner. In fact, in the insurance business there's all sorts of factors that go into your rate such as the type of car, age of driver, location, and safety features based on make/model.