My guess is there will be a Perl 7 designed to compete with other languages, the same way Fortran and COBOL got upgrades to introduce block structuring features. But 7 because it needs to read perl5 by default, needs a 'use Perl6' to process a block of perl6 code and 'use Perl7' to be free to do what it likes.

Update: Given that Postgres at No. 4 database is growing in popularity at 50% pa with the top 3 declining, it is worth considering that functions in Postgres can only be written in four procedural languages: pgSQL, Tcl, Perl and Python, with also the ability to write functions in C. Note also that the scripts pg_load and pg_restore plus a bunch of others including for starting and stopping the cluster are all written in Perl. Perl is also just about the sanest language for the majority of devops work. Perl is also still the main language for some of the world's most successful and complex websites.