I would be totally fine with any sort of duology rather than a trilogy as long as it serves its purpose instead of diminish everything that was before.
That said, I would think of it more as an epilogue to a saga that imo was concluded satisfactory. Some kind of a reminder that balance is nothing permanent and you (as an anybody -> nobody) have to fight for it. It was mentioned here before, but a title like “Shadows Of The Empire” or “Shadows Of The Dark Side” would actually be quite fitting.