Now that I think of it, a guix fork would be far more useful than a nix one. You could forgo some of the FOSS extremism, and allow your users to install it without an ethernet cable, and maybe even on the infidel Operating Systems (even though guix is in the official repo for Debian + wsl).

And I bet guile could really use the attention. AFAIK it's mainly developed by one dude, and he made some impressive improvements. Just check out the release speeches on youtube, massive jumps between versions.

Best of all, the GNU people could focus on building a better core, and choose to adopt only some changes, while preserving the purity of their system.