> If my dentist offers free rides to the office in return for my loyalty, I'm quite happy to take that.

That's actually a really interesting angle. The same way businesses often provide free parking now... what if they start providing free self-driving round trips?

E.g. spend $75 or more at Whole Foods, and get free round-trip up to 20 miles or something. Especially for bulky items like groceries where a car makes a big difference, I can totally see that becoming standard. Home Depot too. Plus entertainment like amusement parks, movie theaters, spas...