They've been living like man and wife for about eight years now... do you really think it would make such a difference if they get 'officially' married now?
BTW, I don't think this thread belongs in GM...
I know what you're saying but marriage is a distraction and emotionally draining, which is a recipe for disaster for a top sportsmen. Some can deal with it, others can't. Better not to risk it if you ask me.
P.S. I followed the link from General Messages, I'm not going to become a regular poster in Federer's forum