I think you are forgetting one important thing. Perl6 is being designed to be a twenty (or even fifty) year language. There should not be a need (nor want) for a Perl 7.
Update: Although, going back to Apocolypse 1, I see that there will be a Perl 7 and that Perl6 is the prototype. So instead my last sentence should say "There should not be a need (nor want) for a Perl 7 for a very long time".
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