I deal with the Disney media people all the time. They say the most frequent request from the media they get is to put webcams on the ships and in the parks. The understand why we ask about it. But THEIR bosses have made it clear it will never happen. Disney is always is concerned about image, and they are just concerned something controversial would happen and be caught on the live cams.
Good lord knows how many issues they have had with woman flashing the camera at the end of Splash Mountain, and that is a far more controled environment.