They'll never bring any vaulted story content back. Thanks to their "evolving game world" and way the story is going, it would confuse a bunch of people. Can you imagine seeing Ghaul accept Caiatl just to see him conquer the Traveler? Or how about seeing Crow being friendly with us just to see him kill Cayde and refer to himself as Uldren? The story now only works for people who have played since the beginning.