"So, would you be fed up of hearing about it if it were your child that were missing?". of course not, because it would be my child, but it's not. My ds is aware that Madeleine was lost, and he's heard her name on the news etc, but he certainly doesn't need to know that she was taken from her bed, the place where a child is supposed to feel the safest.
tbh I don't see the point any more. If, and IMO it's a very big if, but if Madeleine is still alive, then she almost certainly won't look the same as she does in those adverts/posters etc.
Anyone who can calculate the abduction of a child from the apartment at a particular time so as to abduct her in a half hour slot, is surely inteligent enough to know that her picture will almost certainly make it into the media, and it would therefore be adviseable to change her appearance. And even if they hadn't thought of it initially, as soon as the media coverage began and the poster campaign etc, they would have almost certainly taken steps then. The long hair would have been cut off, died, and you'd have to get pretty close to look for the blemish in her eye, something which you wouldn't do if it was a brown short-haired little girl as opposed to a long-haired blonde one iyswim.
But I think it's highly unlikely she's still alive tbh.