During Summer of Nix, @DavHau started work on dream2nix, which is a framework for wrapping up the various lang2nix tools in an easy-to-use and easy-to-implement manner: GitHub - nix-community/dream2nix: Simplified nix packaging for various programming language ecosystems [maintainer=@DavHau]
This is still in the early phases, but I am hopeful this will simplify the lang2nix ecosystem and make it much easier for new tools to be created. Along with the RFCs from @Ericson2314 (like [RFC 0092] Computed derivations by Ericson2314 · Pull Request #92 · NixOS/rfcs · GitHub and [RFC 0109] Nixpkgs Generated Code Policy by Ericson2314 · Pull Request #109 · NixOS/rfcs · GitHub), this could be a nice improvement for Nixpkgs and the wider Nix ecosystem.