I'm a marketing type, and this situation does bug me.
Flight of fancy:
Perl 5 skips to Perl 7.
Perl 6 gets renamed to Perl Whatever.
People will weave a new set of ridiculous misunderstandings about why these name changes have occured, but my sense is that these names would work in both the short and long term for both Perl 5 and Perl 6 in both press and public contexts.
Re^9: A wholly inadequate reply to an Anonymous Monk