It's my opinion we should have this setup by the weekend as a viable way to play and setup the leagues to enable uploading save states using Retro.
To me, only question remains if the leagues moving forward should allow being able to upload a save state from either Retro game, or Hamachi, or just Retro.
I think in J&J's Summer League, obviously guys started the league using Hamachi, so you'd want it to take both forms.
But moving forward, it's probably easier to have the ability to DO both, but might cause issues if one guy wants to use Retro only, and his opponent only wants Hamachi, especially come playoff time. AND we all know, especially come playoff time, how c&nty some on this site get, so I'd probably have only one option in any league I ran.