If the announcement had been (if this is indeed the case) something like "although technically he is no longer in a coma, he is not able to communicate and unfortunately this is not expected to change", I think the pressure would have been incomparably less.
I personally don't think anyone should feel forced to reveal confidential medical information in return for ending media pressure. It's wrong for the Schumacher family and it's wrong for any other well known individual who is put under pressure to go public with details of an illness or medical condition.
The other problem is whilst it may well stop such pressure for a while, it won't stop it forever. Six months or a year down the road the same media would want a fresh update and it all starts over again.
We, and the media, have more than enough information. He suffered a severe head injury and is not the same person we knew. Knowing more than that doesn't really change anything other than perhaps scratching the curiosity itch or temporarily adjusting the image we might have of him in our head.