What's funny to me here is that, as a long time Arch user, I have been considering switching to NixOS. One of the most terrifying thoughts to me is that after using the same Arch install for 2 years I will spend ages trying to recreate it if I ever have to. Oh, that and Nix letting you test packages seems like a cool feature.
This would likely be the plan. This is solid advice really for anyone swapping distros really.