Something that struck me after the SIA disaster (dep on wrong runway), the Paris Concorde crash and again after the Comair, Lexington crash is why in this day and age it is not a requirement for all major airports to have F/T video recording of all runways / taxiways.
It does seem quite incredible that such an obvious AND CHEAP technology is not already mandated. When there's a crime on the High St or even a theft of a can of beans from your supermarket, the first thing the police / investigators do is pull any available CCTV footage. The Paris accident investigators were left begging for images from any passengers in the terminals who might have snapped a picture or a passing truck driver who happened to be handy with a video.
Granted this would not be a 'catch-all' solution, but video images for the investigators would be a simple yet giant step forward from where we are now.