Good post, ETOPS. And it does raise a point I touched on earlier. Not only are these cameras very high quality (as well as high def), they are also on tripods. That takes out a lot of the variables from hand-held. Footage from a level, known point of reference provides a datum from which to do meaningful analysis of the display. Allied with forensic physical evidenence and statements, their footage will be able to help with investigation.
PlanesTV may well lose their original footage for a while, backups are a must.