The short answer boils down to, "It might be dangerous, you go first." Moving to a brand new language (which is what Perl 6 is, despite its long incubation and its vestigal name) has real costs - the libraries you have come to depend on aren't there, new libraries to replace them aren't all written yet, some might never be, the ones that exist aren't as feature-complete and battle-tested. For a new language to get adoption, someone needs to go in there and start doing those things, and deliver a value proposition. If a language wants to get followers, at least in the beginning it's better to have one "does it better than anyone else" area than to be a jack of all trades, too.