He means, can he subscribe to MLB:EI next season WITHOUT superfan and still watch games on NESNHD and YESHD in HD without superfan now that those channels have been made national (and the blackouts would not affect him since he is an MLB:EI subscriber)
The answer: doubtful. They will most likely black out the HD channel carrying the game unless you have Superfan, even if the SD version of that channel is unblocked because of your regular MLB:EI subscription.
I mean, I can't guarantee that, but that's probably how they are going to do it.