It will take at least another decade for self-driving cars to mature, if not much longer than that. This is still nothing more but a limited scope PoC. A trial in a city in a desert where the weather is fairly stable with no snow, operation hours limited to daytime etc. is nice. Let me know when it can drive itself from one coast to the other, handle all-year-round weather, conditions from urban to highway and do all of that at least as safe as humans, if not better. Until then it's just a PoC.