It's important to consider the implications of (autonomous) ride-sharing companies attempting to monopolize transportation. On a personal level, Why would you take an autonomous car to the train, when you can just take the car to your destination? It would only make sense if the train was significantly cheaper/free compared to a direct trip with a car. But it's highly unlikely public transport will become cheaper when it's hemorrhaging ridership to rideshare companies:
Uber and Lyft are siphoning riders from public transit, study finds
Researchers say ride-hailing hurts bus and rail ridership, increases traffic congestionhttps://www.autoblog.com/2019/01/23/uber-lyft-public-transit-study/Now, what do companies like Uber or Lyft or Tesla want? Do they want hybrid transportation infrastructure? No, of course not. They want you to use their product. They don't want to lose fares to subsidized transport. Is this already happening? Yes, of course....
Texas town ditches its bus service for ride-sharing app Via
https://www.theverge.com/2018/3/12/17109708/via-arlington-texas-rideshare-app-replaces-busHow one Ontario town used Uber to solve its public transit crisis
Like every other public transit system, Innisfil Transit has a fancy logo, flat-rate fares and plenty of folks who use it to get around town. What it doesn’t have, however, are buses or trains, unionized drivers, transit stops, fixed schedules or any of the other expensive and complicated burdens of conventional transit systems.
https://www.macleans.ca/society/how-one-ontario-town-used-uber-to-solve-its-public-transit-crisis/It should be common sense that autonomous cars will not decrease emissions, but rather increase them substantially (using a robust public transportation system as the base case). Putting a single person into a huge hunk of metal that drives them autonomously to Applebees will not solve climate change.
The transition towards full autonomous car transportation would require public transportation to be dismantled in tandem. Not only that, it would be the greatest endorsement of suburban sprawl, as every McMansion would have their own personal computerized chauffeur. Anecdotally, the biggest obstacle people have living in the suburbs is the commuting nightmare. And autonomous cars eliminates that nightmare, even if it increases congestion and commute times. The luxury of being taken to work while watching netflix by yourself is profound in our perverted society..
If autonomous cars becomes the evolution of car transportation, it will be one of the fatal flaws that leads to climate change catastrophe.