I am sure our Australian friends can make good use of this too in the near future...
Based on what I gather in my country the use of Perl is actually in decline, while Python's is growing. Then there's Ruby that's also popular (not sure if it proves to be stable as Python's growth though).
This does confirm, at least for me, why IronPython and IronRuby happened, but why IronPerl is nowhere in sight. Of course, YMMV in your country, but I think it is a global trend to be honest.
He keeps differentiating, flying off on a tangent.