Not an expert but in general that's usually not how tech works. It generally gets commodified and cheaper : TVs, mobile phones, computers etc etc. They're either becoming cheaper or you get a way better product for the same price (think of today's TVs that make the 80s tvs look like something from the middle ages). Yes Google in the initial decade will possibly have a big head start but in the end Tesla and a bunch of Chinese names will also run robo taxis in the U.S. So my take: efficiency and competition should bring prices down in a non broken economy.