I don't know what language we'll be using to solve ubiquitous, practical problems 20 years from now, but I do know it will be called Perl.
Don't be so sure. There are many other languages out there, all of which have their uses and several of which do what Perl does at the same level (or possibly even better?).
Many things change considerably over time as well. Will Perl be able keep up with these changes, or will it amass too much baggage to remain useful? Keep in mind that overzealous advocates who turn people off a language can be considered "baggage" as well.
You're also preaching to the converted here. I see far too many of these "Why Perl is so good" posts. It would be far, far better to focus on why Perl isn't so good, and how we can fix it.
That should be enough to get the flames started :).