I do think it's selfish of his family to keep it all a secret, he his loved by millions of fans worldwide. Telling the world about his condition isn't going to change it in anyway, why not be honest about it?
I share your feelings, in part, but not completely. After all just because someone is a public figure, does not give us the right to know all about something like this. But there is the other side of the coin.
I said it before, thanks to social media and the internet, people following a particular sport may come to know the personal lives of certain participants very well. While, it may all be an illusion developed from marketing efforts and slant in the reporting, (and we might really be shocked to meet the person in the flesh and spend a few days with them), I know more about MS, Lewis Hamilton and others than I know about 95% of my relatives and even good friends.
So when something happens to someone such as Michael Schumacher, I want to know all about it, because I care. It is no different than wanting to know about a serious medical condition of a close relative. How are they doing? What is the future for them? Will I ever see them awake and conscious?
OTOH, the family is entitled to their privacy, and I certain that if they had their (and Micheal's) desires on these matters honored, they want him to be remembered as a seven time world champion, loved and hated as he was, and not how he is now.
I have always had a problem with funerals. I want to remember them as I knew them before in better days, and not as a body laying in a casket.
So I pray he will recover, not merely for his sake, but for his family, friends and family...............