Some people are left with major deficits very quickly and plateau. Possible, rare, but true. Some people's deficits ratchet up bit by bit. And there are all sorts of combinations of these. But all of this can change at any time.
Past experiences mean very little on an individual level.
Future experiences are yet to come. And grabbing labels to predict the future does little to tell you what it will be. Even the same symptoms, like Optic Neuritis, are experienced differently and may be objectively different. You are still the same person you were before diagnosis. And you still remain the same person as the disease runs it course.