Autonomous cars and fusion are very different creatures than the growth of the internet or computers in general. The latter was widely distributed and had low hanging fruit that just about everyone in society could pluck and have fun with, the former is something a handful of companies and a few hundred researchers will get to develop while the rest of us will have to have our creativity satisfied with the fulfilling act of paying for it. (Even ML to an extent, since it's so data and compute expensive - generally far from a low hanging fruit -, though less so.)
The internet took decades to evolve and was heavily funded early on by government. It only became low hanging fruit once it achieved a high level of maturity -- largely until the WWW had a graphical browser.
