"They live" only to you. These are six parallel and disconnected attempts, over the course of many years, to produce "a successor to Perl-5" with and without a Brick in The Wall. All failed. The only viable "successor to Perl-5" is what everyone else is using: Java.
Re: Perl 5 Optimizing Compiler, Part 8: The Book Of RPerl
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P2 is Reini's new project, and he is not the kind of guy who is going to quit until he has a working system. He got B::C working.
Moe is "experimental", and has already succeeded in that regard.
MoarVM is written by jnthn and diakopter with bits of help from Larry. I expect Moar will be considered "official Perl" at some point.
Larry's own STD_P5 is, well, written by Larry. I expect STD_P5 will also be considered "official Perl" at some point.
By combining MoarVM and STD_P5 we may end up with a real Perl 6 or even Perl 7.
RPerl is alive and well, I know because I'm the creator and lead developer. Until somebody else can compile my low-magic Perl 5 and have it run several hundred times faster than Pumpkin (P5P) Perl, then I'll need RPerl.
And I haven't even delved into other awesome projects like fglock's Perlito or goccy's gperl.
Oh, and Pumpkin Perl. I suspect P5P will continue supporting the rusty chainsaw until we can make a fully-backwards-compatible transition to a Perl 7 or Perl 11 solution. Maybe mst can make Pumpkin pie and create a fork optimized for extreme speed, maybe not.
So yeah. I think you're sorely mistaken, my friend.