You're right, it's not perfect, and it might be sub-linear improvement, but it can practice on its predecessors' input in a way a human can't. (There are plenty

You're right, it's not perfect, and it might be sub-linear improvement, but it can practice on its predecessors' input in a way a human can't. (There are plenty of scifi stories where they found a way to do this for humans as well, so it's certainly conceivable, but seems a long way off, whereas "feed all existing training data into the new model" is something we have now.) You're pretty much guaranteed that self-driving technology "skills" will collectively improve over time, at some positive rate, whereas we don't expect "Gen Z" to be more skilled drivers than previous generations. This is all entirely skill-focused. We're not guaranteed that self-driving cars will actually get safer if we don't have the proper incentives to favor safety over speed or cost. Similrly, despite the stagnancy of human driving skill, I anticipate safety will improve with human drivers for non-skill-related reasons -- specifically, driver assistance technology, and a shift towards just getting a Lyft if you're impaired.