>> 150mph travel without slowdowns for congestion will cut travel time to less than half.
Yes, just as the shift to supersonic air travel radically reduced flying times.
>>If you want to drive manually, go to the track
"Take it to the track" has been chanted for decades. It has long been possible to build cars physically or electronically unable to break speed limits. No such product has ever been brought to market.
>>The trigger for outlawing manual driving in cities and on freeways will be the convenience factor.
No. The convenience of me parking my car 20feet from my door, being able to hop in and out of it without planning, is far more convenient than having to call a car via an app on my phone. The knowledge that I have a car available 24/7 cannot be replaced by a promised car delivered via a cellphone.
Driving is not hard. It isn't even remotely dangerous compared to many jobs (I'm wear camo to work). They will have to come up with something far better than a 0.01% decrease in my risk of dying before I trust Uber to get me to work each morning.
Counterpoint: Motorcycles are exponentially more dangerous than cars, yet they persist. Driving is not a purely rational act.