Taxi services can potentially complement public service by filling in the gaps: last-mile connections (home to train station) and backup service late at night when transit runs less frequently or not at all.

There's a risk that robotaxis could become too cheap and people use them for point-to-point transportation because it's faster. This could be mitigated through taxes on robotaxis (with incentives to connect people to transit) and/or car usage in general, or maybe using robo-buses to provide a middle ground between personal convenience and system efficiency.