This tracic accident reminds me of a discussion we saw here some days back, about cockpit cameras and the likely misusage of the content by others than accident investigators. In this particular accident, I think cockpit cameras would have been of very limited usage (-and yes, I am against them), but recording cameras pointing lenses to specific parts of the aircrafts like the tail, wings, undercarriage etc. would have been of much more value, at least in this case for the investigation of the accident.
I am also sure these outside cameras -if technically advanced, would increase safety and be very useful during many ground operations, e.g. to monitor flight control checks, flaps, ice or snow on wings, closed/open fuel panel, if towbar is disconnected (its often hard to hear the groundman when eng. are running after start), status of landing gear with unsafe cockpit indications in flight etc. etc....
Best wishes to the families of those lost.