> With Nix it seems like the technology is there. It works. It has a superior model compared with other systems. However, it lacks a corporate sponsor or large community to make it "professional-grade". Canonical and RedHat make their money from people depending on their packages being continuously up to date.

Check out bosh: http://bosh.cloudfoundry.org/ . It has a somewhat similar philosophy with respect to immutable instances and systems at large, and has strong corporate backing.