Id like to see Michael Ball as Phantom too, but somehow i think that the range may be a bit tough for him to handle ona regular basis, all his recordings of Phantom songs have been in a shightly lower key. I think if he thought he could handle it he would have done so by now.
But then again he did recently play Valjean in Les Mis, so maybe he is waiting till he is a bbit more "older"
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre