I mean, I expect as time goes on the number of people who get the reference goes down. Things get diluted.
It slowly goes from a "Here's some very cool esoteric thing, that you can use" for people that write business systems in prolog, to "here's how to connect workaday language with workaday db in a slightly unique configuration".
edit: I looked at the videos. 10 years ago the talks were Rich Hickey and "Production prolog".
Did Douglas Hofstader ever speak at strangeloop? I know he doesn't actually like computers.