The draw of CoreOS Linux for me is its curated pairing of the Linux kernel, Docker, and etcd. There was a commercial entity reviewing upstream changelogs and making sure that they were pairing components appropriately. I wonder if an non-commercial district can really get this right.
Take a look at Linuxkit by Docker: https://github.com/linuxkit/linuxkit . I didn't develop it, but I use it indirectly via Docker for Mac, which I use a lot. The latest version supports Kubernetes. This means Docker commercially maintains a Linux/Docker/Kubernetes stack that needs to run reliably on what I think is a very large install base. They have open-sourced the system they use for this, it's called Linuxkit and it's a very cool, underrated project.
I'm using NixOS happily since 2014 after getting messed up in pacman dependencies on Arch and haven't looked back.
But their too radical shift from LSB makes for a less attractive enterprise story. Hopefully GuixSD[1] can plug that hole due to the GNU brand as it has been progressing nicely.