We could very well have asked what was the use in learning Go in 2010, but look how that turned out.
Perl6 is currently a very interesting language with a relatively weak module ecosystem. Which is a position many languages have been in before.
Let's not dismiss it out of hand.
I always thought that would make a world of a difference.
Here is a gist where I'm calling out to some Python. It is not done in the magical future way (which is in progress) of just doing "use matplotlib::pyplot:from<python2>" or similar, but not too bad.
https://gist.github.com/awwaiid/ef3f0abcfa96e34977b4
(I wrote this some months ago -- it can be a bit cleaner now)