So we're all aware of the various releases of the Star Wars films on VHS/DVD/Blue Ray etc. You know, add more Gungan Stormtroopers or Dewbacks, or digitzed Jabba the Hutt talking to Hann, and don't get me started on the Han/Greedo shot first thing.
So why not add a "Directors Edition" to the lineup of Weeklies? Get the chance to re-live the betrayal of Havoc Squad in the Trooper Prologue or rekindle the puppy love when Dark Jaesa becomes your naughty Apprentice after Chapter I of the Warrior line. Remember how great it felt cleansing your Agent of the Onomataphobia in Chapter II? Relive the glory of your Knight's final confrontation with the Emperor
Add a weekly to re-play the Prologue, Chapter I, Chapter II, and Chapter III. Most of those are done in instances which could be scaled to level 50. Some of the overworld stuff wouldn't be able to scale but those are usually just disable comm relays or get a badge or something quick anyways.
With all the class quest choices you have along the way, they'd have to add something the journal or codex to track how you dealt with the various traitors of Havoc Squad or who your Sith killed or spared on their path towards Darth-hood
They could also add a weekly Planet Questline too. Go back and dig up that thing that Czerka found or see what happens if you change your answer about the Gormak heresy