> The dataset available will never be large enough to allow ML autonomous cars to solve every situation a human driver can.

Not every human driver can solve every situation that the best human driver can solve. Also, the most dangerous situations happen at high speed, which humans aren't great at handling unless we've had a lot of training. The main reason I'm optimistic about autonomous cars is that a system like Waymo's will only get better and better over the years. And newly produced cars will be just as good as "experienced" cars.