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By "reshaping the practical world of programming languages," I assume you mean taking your
incredibly popular language, that had become the de-facto scripting language for Unix, and
announce to everyone working on it that their code is going to be obsolete when the next
version comes out, zapping all the energy out of most of the projects using your language,
then taking over EIGHT YEARS to produce that next version, ensuring that all the little
languages like Python and PHP that used to tremble in your shadow got all the forward
momentum.

I admit Wall has completely reshaped the practical world of programming languages, he's made
one in which Perl isn't relevant in anymore.