Adoption of smartphones was also learning to adopt to a major technology change.
Adoption was also spread unevenly. Some parts of the country moved past flip phones long before others. There are still holdouts!
Cars will be an entirely different matter. People are trained to accept internet enabled devices and ridesharing already.
Once insurance rates for manual navigation clear those of an autonomous fleet vehicle, people won’t want the oil can Henry’s experience anymore.
You can already tell most people don’t want to drive anyway. They are looking at their smartphones as they idle down the street.