It's not for individual owners.
Seems to me that a company is going to need to sink many millions in to design, build, and test a truly road safe self driving car no? Even considering it as a hardware and software mod to an existing model.
Robot drivers are a new and unproved technology. After not too many years I'd expect that they will cause way fewer accidents per mile driven than human drivers.
But I agree that it is low.
But the requirement that two drivers need to be in the car will restrict it to no one who wants to invest in it to be more profitable.
Right now this is simply for experimentation and I wonder who'd drop one million dollars just to experiment?
When you require two people with a driver's license in the car at all times you kill any profitable commercial reason to use self-driving cars. And that to me is a huge mistake.
Commuting to work (if you drive > 2 0minutes at highway speeds) is probably the most dangerous thing by far that all of us do on any given day.
Distracted drivers, drunk drivers, sleepy drivers (like me!) this is why we need self-driving cars.
But I think the path to mass use of self-driving cars goes through commercial use of self-driving cars.