It was either the Greeks or the Romans that discovered that it was far better to employ people rather than keep slaves . They were more productive and lived longer , plus the money they earned helped to drive the economy .
Yet both of those cultures viewed slavery as normal

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Am not sure how the link between autonomy and slavery can even exist? But time is the biggest commodity around, its actually worth far more than money. Jobs essentially swap time for money, the difference been you never get time back, ever, and money, well that is a purely human abstract.
Autonomy for personal travel has the potential to release so much time for everyone that is current trapped by essentially the logistics for getting people/things from A to B. When/if the technology arrives, who ever can work out how best to monazites that free time will become the next billionaire.
Tesla gets all the press on 'Full Self Driving' but Waymo (Google) has been at it for far longer and spent much much more $$$$$$$. One thing am sure everyone realizes with Google is they never do anything for 'free', Google already has so much personal data on everyone, imagine their 'worth' if they now controlled personal transportation!!
Am genuinely fascinated to see how all this develops.