These are some interesting results. That said, fully self-driving cars almost certainly won't exist any time in the next 100 years anyway, so I don't think this will be an issue. By the time, if it ever happens, that fully self-driving technology is created, society will likely be so different from what it is now that the issues this article raises will no longer be valid. Fully self-driving cars require artificial general intelligence, so to me a bigger issue if they ever exist would be whether it is ethical, given that most likely in principle no objective test for sentience is possible, to use more-or-less human-level intelligences as slaves.