People do apparently, of their own volition, get well following CFS and go on to lead normal lives, what does this tell us about a virus based cause?/QUOTE]
I can't agree with you about this. The disease has unfortunately, and very wrongly, been used as a wastebasket diagnosis. Uninformed physicians sometimes declare anything they can't figure out to be 'CFS'. People who may feel unwell for any number of reasons, possibly with self-limiting, mono-like illnesses, have their illnesses resolve, and honestly think they had CFS and recovered.
I take issue with any theory that holds that people recover through their own will. Some very, very strong-willed, passionate people who have tried everything to get well, remain extremely sick.
We really don't know enough -- thanks to a quarter century of medical neglect -- to draw any such conclusions. It remains to be seen whether or not XMRV is causative and if people who were sick and recovered are positive for it, or not.