Realistically speaking, Nix will never become widespread. Instead, I foresee immutable OSes like Steam OS, Chrome OS and Fedora Silverblue combined with someth

Realistically speaking, Nix will never become widespread. Instead, I foresee immutable OSes like Steam OS, Chrome OS and Fedora Silverblue combined with something like flatpak for installing applications. The evolutionary strategy of reproducible snapshots of state has historically been far more successful than "pure" functional approaches; see Docker for example, or reproduction of DNA based lifeforms.