Legally, it does. Among other things, it means that there is a very high likelihood that if Terri were to receive therapy from someone who actually wanted her to communicate, she could. In which case there would be no need to guess about her wishes.
Considering that during her therapy period prior to the monetary award, she was improving with therapy, I'd say the abrupt and forceful halting of ANY therapy and forcing that to be carried out for the last decade constitutes grounds for dismissing MS as guardian. Sadly, he may have at least succeeded in making her more vegetative and likely now, dead. There are so many reasons for a true de novo hearing ... but alas, Terri must now be disposed of quickly, to prevent possible embarassment to the Democrats and their constituencies demanding that she be 'allowed to die'.