A great idea but almost impossible to put into effect. With the number of plains that are in the air everyday it would mean hundreds of people watching the live feeds for 10 - 15 seconds then going to another camera view.
Something needs to be done, even if the cameras are installed and the information is sent to a remote center and recorded and possibly viewed at a later time. This would help to eliminate a lot of air rage cases where there is no proof of who is at fault.