By simply adding autonomous cars to the current infrastructure, it doesn't improve peoples lives in a directly obvious way. They can't go any faster, and traffic does not get reduced. Yes, there is the imperceptible benefit of a slight reduction in the probability of death, but a recent New Yorker article pointed out that antisepsis was slow to be adopted because the benefits were not as easily measurable -- in contrast, anesthesia, invented at the same time, was adopted worldwide almost instantly. I personally would only buy a driverless car if it meant I could immediately get where I am going twice as fast. Otherwise, I rather enjoy driving.