I'm sorry I completely fail to understand how either of these remarks have any bearing on scalability?

How does the Perl6 project's ability (or lack of) to deliver a project to your undefined criteria for "usable version" have any bearing on the scalability of the ideas involved in either it or Perl5?

Second, in what way does a self-described popularity contest have bearing on the scalability of a language?

I would also love to hear how you would explain http://www.tiobe.com/index.php/paperinfo/tpci/Lisp.html which Alan Kay also talked about during that interview ... far more than the single quote he made about Perl. Note that according to the scale on both the Perl graph and the Lisp graph, Perl's lowest point is roughly equal to Lisp's highest point. The obvious explanation to me is that TIOBE score has almost nothing to do with Alan Kay's comments or opinions as expressed in that interview. So I don't understand what connection you're trying to imply exists here.

Perhaps you had your book on logical inference upside down?

TIOBE is the phrenology of programming language discussions, and making changes in an established programming language is exceedingly difficult even when you intend to replace the existing version. See also Python 3000.