Robotaxi wasn't even real anyways. They had closed, specially designed streets, and IIRC, still had remote human operators on standby supervising.
What Tesla (or any EV manufacturer) needs to make is an electric city bus.
Low speed is better for EVs, stop and go doesn't really matter. Instant torque makes them easier to drive. Quiet operation reduces sound in in cities. They have dedicated bus garages to charge at, and they would cost less in energy and repairs than conventional ICE options.
The only big downside I can think of is weight. Busses are already a huge impact on street maintenance, making them 50% heavier might push them over the limit. Smaller more frequent busses are better for the customer if you ask me.