Did investors really believe that? I don't know a single person who believed that years ago when the pre-IPO valuations were going through the roof. I maybe knew a few people who believed it was possible one day but not anytime soon. It's wild to me that so called sophisticated investors really believed that in the not too distant future uber would have a fleet of driverless vehicles shuttling people around.
FWIW, I don't believe we'll see anything like that in my lifetime (I'm 37). The last few years of development in this space, for me, have proven that it's a much harder problem than people thought and that the early big improvements in the tech gave people false hope.