AI driving being opened to public is far in the future. I have been in the field of robotics for a while now and have had opportunities to study a few prototypes. There are at least two decades before we see these vehicles being allowed to be used without a special permit.
The current trends show that delivery drones would much faster become a standard and that should at least reduce some pressure on the roads (very very small).
I am thinking 10 years and they will make up a small percentage of the traffic, 20 and a lot more.