What do you mean by "prognosis"? As you are learning, there is no way to know, early on, whether your MS will progress quickly or slowly. Some folks have a lot of attacks early on, then the disease seems to level off and they'll not experience much for months, even years. Other folks will rock along for a long time with little disability, then be hit with a serious exacerbation. Some folks will recover completely from flares, particularly early in the disease course; others will always experience some residual disability.
There simply is no way to know. There are folks who post here who have had MS for a long time, 25 or more years, and who are still doing ok; others of us who have had MS for a long time and who deal with serious disability, but are still alive and doing OK (but then, if I wake up in the morning, I think I'm doing OK!! )