>> “I don’t think anybody in the 90’s thought that you could hold a computer as powerful as a Cray supercomputer, nut your smartphone is exactly that, even more so.” <<
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That statement isn’t true.
You may not have thought so, but the rapid increase in computing power was an accepted principle since the early 80s.
Moore’s law.
Computers would keep getting more powerful, but only a few insiders thought it could shrink so much. Bill Gates, for example, is quoted as saying that he didn’t think software would ever need more than 640 k to run.
Anybody can make wild predictions, it’s a matter of being correct.
I just read that Intel expects computers to eventually be powered by solar power, like your calculator. If we can get solar power to that point of efficiency, there’s no reason why it cannot also power your home lighting as well.