Self driving cars can be effectively perfect - if we finally stop designing cars that cater to human drivers and stop trying to look like current cars. IMHO, if we finally accept that AI cars are different, we can achieve that level today. It starts with making use of AI's fast reactions and designing the car around that. Put the humans in the middle, and accept that the passengers have no role in driving, so you can pad them (and the front) so that crashes have much less effect. etc.