I think it means that Catholics were forbidden from eating meat on Friday, and it predicted that they would come around later..........and they did. They are the only ones I know that forbid eating meats at all, and also forbid marrying among their 'priests'. Who else could it mean?

And why does it matter WHEN the Priests were forbidden to marry? The verse says that heretics will arise that will do that. It doesn't predict exactly when. Just that it would happen, and it did.