Back in 2000, when Perl was riding high and 13 year old, Larry Wall announced "Perl 6".
Rinding high is something of an overstatement: The Big Thing at the time was Java, and PHP was already chewing away at Perl's market share. Some people thought the writing was an the wall, hence the mug-throwing incident that launched the Perl6 effort...
So for the best part of the naughties, people said things such as "don't bother learning Perl 5, Perl6 is coming"... Then the 2010s came and people got on the RoR and PHP and Python trains in the meanwhile instead.
https://www.slideshare.net/eflorac/perl-presentation-2013-pa...