Considering that Python 3 is barely getting installed by default on OSes (Arch were the pioneers, doing it very early, but everyone else either did it 5+ years after the Python 3 launch or haven't done it yet, 10+ years after the launch), I wouldn't hold my breath.

And Python is a much popular language, compared with Perl, plus the Python 2 -> 3 changes were much smaller than Perl 5 -> 6.

I'd venture to say that besides some very niche distributions, Perl 6 will never be included in the base installations, unless it gets some killer app.