I'd say people are actually pretty good drivers. I'm more interested in autonomous for the time savings than I am for the potential safety improvements.
Tens of thousands of people are killed every year[1] in just the United States, humans are awful at driving. If autonomous vehicles are able to make driving as safe as flying it will be like curing breast cancer in terms of lives saved.
[1] http://www.nsc.org/NewsDocuments/2017/Fatality-estimates-Jun...