>Almost all technical problems of self-driving cars are solved by current algorithms once we get 100x faster HW,

That sounds off to me, because my understanding is that the computer is a small portion of the cost and the mass of the self-driving car. If you could solve the problem by just filling up the back seats with computers, someone would have prototyped it, and probably even brought it to market as a way to drive large vehicles.

(I mean, unless you were on some non-parallelizable process, but my understanding is that most image processing tasks are massively parallel.)