Not enough people on the bandwagon, competition from Ruby/Python/JVM languages on the high end and Perl 5 on the low end, and last but not least the fact you can't use libraries written for Perl 5 with Perl 6.

I wrote a medium-sized project in Perl 5 two years ago. It is my day job right now to work on it. I have very little interest in rewriting it from scratch in any language, but if I did, it would probably be either Ruby or something on the JVM.

Good point about Ruby. I forgot that it's the good looking and smart bastard child of Perl.

For me, it doesn't have all the libraries I use in Perl 5 whether as libraries or core features.

Because it's 1000 times slower and doesn't have a wealth of libraries available to it, and it isn't finished, and it's not 100% stable.

I suspect they're frightened of the butterfly.