Supported. GGPO can work with 3D fighters and isn't any more taxing that any other netcode. It uses a unique prediction model to eliminate things that cannot happen to streamline the code.
That's wonderful news, WCM. I trust that you know what you're talking about. Hopefully this will put all the naysayers at ease. I would post the same thing over at SRK, however I am not able to log into the front page for some reason.