What lessons are there to be learned from 1989, and have they been learned
Certainly by the airline companies, judging by the way they've so sucessfully divided and conquered the pilot group in the years since - and how they've so successfully ground down terms and conditions to the horrible state they are for most today.
However, judging by the many "not this old boring subject again" comments you see here on Pprune, not too many lessons have been learned by the pilots who have come into the industry in its wake. Possibly because many of them were given a rather one-sided, self-serving version of events by the aptly named "heroes" who returned or blew into the industry post '89.