Will enabling flakes impact my nixos config?

I’d like to enable flakes in my nixos config in order to start playing around with them,

nix.extraOptions = ''
  experimental-features = nix-command flakes

However, I don’t plan on migrating my nixos config a flake any time soon. Will enabling them impact my non-flake configuration or have any other caveats I should be aware of?

No. Flakes is a purely additive feature. If you don’t use the feature, it won’t affect you.