I don't agree with your first sentence. To Watson, his prediction may have been logical, but he was totally wrong about the future of computing.
My point in telling this anecdote was that foretelling the future is fraught with folly, yet humans insist on littering half the news with speculation and predictions, most of which are utter garbage. (a) Why do we continue to do this? (b)Why do we believe these pundits and prophets? Probably the lure of fame, power or money....I can't see much else that would breed this behaviour or our willingness to listen.
Repeat after me....nobody knows what
nobody knows what