Let's step back from the FD door, as a means of prevention. There are probably more posts now on this subject than there were originally from the hypoxia theorists.
ALL that counts is the suitability of the flight deck crew for the job they are required to do. Fly the aircraft from A to B.
Are they mentally fit for purpose? Are they physically fit for purpose?
Are they trained, and current, to meet any scenario that faces them on any particular flight? To the point where there is zero risk of 'pilot error', whatever?
Only then will the travelling, paying public be reassured into placing their trust, lives and faith into their hands.
It would appear that hose who control and enforce such matters are still falling short of their responsibilities.