It is objectively demonstrated that humans are not very good or very safe drivers. According to the NHTSA, there were 36,096 deaths due to motor vehicle crashes in the USA in 2019. The vast majority of fatality-causing crashes were substantially attributable to human driver error.

Further, common human driving heuristics and competency levels significantly limit the level of efficiency that can be achieved on the roadway. In particular, human driven traffic does not interact with itself optimally, and for safety purposes, legal speed limits are artificially capped well below the level of vehicle performance. There is some consideration that autonomous vehicles may be able to safely travel much faster.

For these reasons and more, it is plausible that at some point, humans will be generally or entirely legally disallowed from driving a car on public roads.