PHP did the same thing, skipping from 5 directly to 7 because PHP 6 ended up being a dead-end. It was pretty painless (at least as far as I could see).
“A foolish consistency is the hobgoblin of little minds.” — Ralph Waldo Emerson
“A foolish consistency is the hobgoblin of little minds.” — Ralph Waldo Emerson
PHP 6 was thrown away never to be seen from again, because it was seen as bad.
Perl 6 was renamed because both Perl 5 and Perl 6 are significantly different active languages.
If Perl went to 7 it could indicate to some that 6 was bad in the same way. That is it would trade one confusion for another.
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If Perl truly wants to go beyond 5, it should make a major step.
Either by going to the subversion (32), or the year (2020).