I've made a presentation about it in 2013[1]. Back in 2000, when Perl was riding high and 13 year old, Larry Wall announced "Perl 6". However Perl6 (now Raku) was hugely ambitious and not production-ready until 2015 ...

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...