Given it took about two decades for anti-lock braking systems to become widely available on cars (and that is a relatively simple technology compared to autonomous driving systems), most of us will be dead and buried before there is a significant percentage of self-driving cars on the road. First, we'll see "super-cruise control", where the driver can engage a partial system on a highway but the system will revert back to the driver if certain tolerances can't be met (e.g., weather, traffic levels). You'll still need a licensed driver behind the wheel. This will be an expense option on high-end cars for 5-10 years, then will trickle down to more mid-priced vehicles. In the meantime, the auto makers, in an attempt to cope with the shift in liability from driver to manufacturer, will introduce incremental changes to the system to increase those tolerances, but will still insist that the driver take over "just in case" a deer suddenly jumps out on to the highway. All the while the manufacturers will be collecting data on how the system copes with real-world driving to try to determine at what point a truly autonomous car is possible, and their risk in getting sued for a faulty system is acceptable. Given how risk-adverse most corporations are, especially auto makers, I don't see an autonomous car in my future (and I'm 52). Personally, I think you'll get more insight on the future of autonomous cars from the insurance companies than the auto makers.