In the western U.S. (and eastern suburbs) the 4-way stops are largely vestigial; I'd agree that most of them could go away without any loss of safety. Many of the newer neighborhoods are signed that way anyway, though - I just drove through one this morning with 2-way yields.
My driver's ed class was IIRC 36 hours of instruction and 12 hours in the car, with a professional driving teacher. It had an hour long examination putting me through as many challenging situations as possible at the end.
And on average a person needs 38 hours in the car with a professional teacher before they pass the exam, most people don't pass on the first try.
And don't get me started on driver ed in PA, USA: in my case, it consisted of a video, signing an drivers' permit application - and voila, go out there and drive (under supervision). I was shocked, shocked.
Try 50+ years. Driverless cars aren't happening anytime soon, and certainly not to a level where you literally don't need a licence to drive one.
I strongly prefer those setups because they are much more fuel efficient.
However, I don't think any of that would work in the UD because it would require real driving classes and tests. I had to drive around for close to 20 hours with a professional driving teacher on to of dozens of hours of theoretical classes. All that end in a 30min+ examination with a examiner in the back of the car putting me through as many challenging situations as possible.