I thought perhaps you might like to hear my somewhat unique perspective, although definitely not saying anything others haven't already said. My perspective comes from my three hats, as a perl hobbyist and CPAN author, the maintainer of /usr/bin/perl in OpenBSD, and as someone who has written perl professionally for just short of ten years (the fifteen before that I wrote more and more perl as a sysadmin).
Overall, I think the plan is excellent and hope it mostly moves forward. There's only one tiny issue that might keep me from coming along for the ride.
tl;dr: if the default, without concious indication of something else, for bin/perl is anything but a "best effort at perl5" I believe I, and many other people will be stuck on perl5 forever and never be able to use v7, or v8, or anything later.
First, I should probably explain what I mean by a "best effort perl5". It is the thing we have gotten from perl on code without "use v5;" specified, likely since perl 5 was first released. Most things work, s