Clarification: Decided by the Perl 6 devs who want to keep the name and don't seem to care about the damage that decision does to Perl 5
One of the discussion was on the Perl blogs[1]. Most of the devs there are Perl 5 devs and they also decided against the name change. Perl 6 is the next iteration of Perl that has been redesigned from the ground up. Why should it bare a different name? Yes, the redesign took more than a decade and it's incompatible with Perl 5, but so is Python 3.6 compared to 2.7, albeit to a lesser extent. Even Perl 5.26 has changed a lot since 5.6. In fact the least common denominator is 5.10.1. Using older versions is discouraged since they're largely unsupported by the majority of CPAN modules.
The most recent discussion I saw on this subject[1] makes it very clear that there isn't a consensus. If there is, it's in the "Perl 6 should rename" direction.
[1]: https://www.reddit.com/r/perl/comments/7r1b33/an_open_letter...
> Yes, the redesign took more than a decade
Quite true! In fact, the redesign took more than a decade and a half (July 2000 to Dec 2015). A record worth breaking!
Re:Perl 6 Optimism
by virtualsue on Tuesday January 23, 2018 @12:42PM
(#16215467)
It was a decision made by Larry Wall alone.Since it’s his language, he’s allowed to do that.
If this really had worked seamlessly it would be great.
But that includes /usr/bin/perl working this way on every OS etc... with a clear&easy upgrade path for existing code.
Eventually one would use Perl 5 from inside Perl 6 with the "use v5" statement.