As a google advertiser this made me laugh.
At the same time I don't think expense will be a setback for autonomous vehicles. The reason being that if vehicles are fully autonomous there would be no reason for any individuals to own them. It would make more sense to have them operate like a taxi service. This is because without the costs of having to pay for a driver, it would be cheaper to just order an autonomous vehicle whenever you need to go anywhere than it would be own your own vehicle.
Just from an efficiency standpoint it is terribly inefficient for each person to have a car. We're not driving most of the time and the only reason we have our car sitting in the driveway is we need it to be available should we need to drive. With autonomous cars, my car could on it's own drive across town to pick up other people when I'm not using it. The reason we can't do that today is because of the additional logistics and costs involved in transporting my unused car from my driveway to the driveway of the person across town who needs it. This problem would not exist in a world with autonomous vehicles.
To me, it seems likely that a world with autonomous cars would be a world where the majority of vehicles in the world are owned by services like uber.