Incapacitation
There will always be resistance to anything that to some smacks of a spy in the cab (Sir, I am indebted to be called a glorified bus driver, however did he know?). But surely the critical factor is the "golden time" i.e. how long does it take before suspicion of incapacitation is transformed into certainty? If the pilots are most likely to be beyond resuscitation by the time "other procedures" have been exhausted would a camera, properly used, have prevented this? If the answer is yes, even a qualified yes, it bears thinking about.