Thank you for the wisdom. Just to be clear, though, I wanted to only uninstall the second installation of Perl at ~/myperl and not the one at /usr/bin/perl. I did want to revert back to the previous installation. I don't think I was clear about that.

And, would merely renaming the threaded Perl send my system looking for something that didn't exist?

I guess a better subject line would have been "Reverting Perl".