In 1962, Decca Records refused to sign the Beatles, saying “guitar groups are on the way out” and “The Beatles have no future in show business,”.
While not a tech prediction, the rock group Rush figured that when they released their album “2112” in 1976 it would be their last - but they would go out on their terms.
They finally did hang it up a few years ago after 40+ years!
With regard to tech - I’m still waiting for the regular use of flying cars!