@charles shepherd - thanks for writing a tactful letter to GN. I have gone to the link you provided for prognosis and cant find it anywhere in the 93 page document. I also have concerns about the notion that 'most people improve'. This is not my experience and I have not seen this in other patients.
As a long term PWME, I have years of personal experience and my experience is that whilst some people appear to have improvements initially, after the initial collapse, if you look at the illness over a period of say 20 years, in those that don't get totally better, the rest appear to gradually get worse as time goes on, becoming more disabled, but perhaps managing it better?
Many people also recover, only to relapse many years later. I myself had an almost complete remission for 8 years before relapsing into severe ill health, that 7 years later I have never recovered from. Some aspects of my illness are better (mildly) but others continue to get worse. Or is it just that I have become so used to it that I manage my health and my emotions better and so in fact am not better at all? (as Bell found in long term patients who felt they had 'recovered')