That may be very true, but are most of us fully present in the act of driving ? Where the ML is deficient we can make up for it by making the infrastructure more robust.
Can't make human behaviour inside that infrastructure more robust though. So we'd need to completely split human and autonomous traffic. That'll be about as big a challenge as creating the autonomous cars in the first place.
My guess is at least 15 years before we'll see any large scale adoption of autonomous vehicles. And that's for countries like the Netherlands which are already pretty well organised. Countries with chaotic driving styles and roads like Italy will take longer and the third world might take decades longer because of the lack of rules in many of those countries.