autonomous cars are more likely to be shared and constantly in use, rather than sitting in your driveway 90% of the time.
Sorry, no. If I want to "share" a car, I'll call a taxi, or uber. The whole point of owning a car is that it's there when you need it, and since 90% of the people need 90% of the cars at the same (local) time, namely rush hour, it's not going to benefit me to share the car. Especially if I hop in to find dirty upholstery, or trash in the car, or physical damage to the interior.
That said, electronics are cheap. No matter how expensive they were to develop, once mass-produced, the total cost quickly approaches the cost to manufacture. The reason electronics like navigation and cameras are expensive in cars today is because they can charge a ridiculous amount. Charging for "premium audio," or "lane departure" is all about market segmentation -- charging people 25% more for the same car. Once features start coming standard on low-end models, then new features are added to charge more for, and the process continues.
Since "automated driving" is a pretty basic feature of a driverless car, the technology itself shouldn't cost much once it hits critical mass. At that point, expect car manufacturers to add butt-fluffer massage seats and augmented reality windows and charge thousands. And of course, the "premium audio" upsell will never go away.
