It'll take 50 years, at least, to see most people - in the first world - in autonomous cars. Hell, most people in the snow belt don't even commit to buying winter tires, so the adoption process will be slow. I don't know how well this will work out with a mix of autonomous cars and non on the road. Given all the problems we see with that mix now 2 years seems overly optimistic by a damn sight.
Ad-wrapped cars. Yeah. just what people need, yet more distractions on the road. *sigh*