Wouldn't say that the community is gravitating toward Nix, it's kind of a false split since Cabal and Nix can only be used together and Nix can't replace cabal.

Wouldn't say that the community is gravitating toward Nix, it's kind of a false split since Cabal and Nix can only be used together and Nix can't replace cabal. Though Nix can be used to manage a wider package environment than cabal-install can and then cabal is left to the role of a Haskell build system which it excels at.