Unless you manage to pull every novice, dabbler, and new developer into the community and teach those best practices from the start, you won't solve the problem on a large scale. Programming -- especially the realm of informal, ad hoc programming so well served by dynamic languages -- rewards individual exploration. You don't have to write elegant Python or Ruby or PHP or Perl to get your job done, and you don't have to learn a lot of theory to accomplish a task. You may make a mess, but it's not clear that novices care about that. Why should they?

Perl 6 has an advantage in that most of the tutorials and examples aren't full of bad examples and muddled thinking like most of the Perl 5 tutorials and examples are. I don't expect that to last, but hopefully some thoughtful language design will make abusing the language much more difficult.

No, the key to Perl 6's success is to convince all of the Perl 5 developers to move on to the new language. Also, if they (the Perl coders) go on a binge and port all the CPAN libraries over to Perl 6, that will help.