As mentioned earlier, some companies already have a rule that a flight attendant enters when 1 pilot leaves.
Given this incident, & the suicide last year by the EMB 195 in Namibia (?) it seems common sense that this be universally adopted.
It covers everything from Loonies to incapacitation, the only risk I can imagine being that the flight attendant could be a suicidal nutter who knows where to find a fire axe
Nothing can ever be perfect I guess
