I have been watching the hamster wheel for the last few pages, only Pace seems to have alluded to the one thing that really matters and that is 'Perception' by the SLF that pay the airline's operating costs including front and rear crew wages.
Whether the aviation industry likes it or not ( and "not" seems to be the flavor here) the traveling public is starting to mistrust the industry. It is unfair but TSA and security worldwide is lumped into 'the industry' too. Now they have seen that one of the skygods has feet of clay and has apparently killed a planeful of people around the 1st anniversary of MH370 which seems to be a similar event. They are scared by all this whether you think that is unreasonable or not and you can quote statistics and Bayesian priors at them as much as you like they will just become more scared.
Something else that is with that feeling of unease is a creeping loss of trust in the flight crew. Repeated arguments against video recording or streaming recording data (regardless of the merits of the arguments as this is perception) add to the loss of trust. This is the same illogical loss of trust that some people here are exhibiting against flight attendants in the cockpit who also make your coffee and bring you water which you happily drink.
The problem with trust is you cannot 'take someone's trust' they have to give trust to you. Once the industry loses the trust of the public it will be extremely difficult to get it back. So some of the positions taken here such as only 6 aircraft have crashed killing pax in the last few years because of pilot action this is a minute number compared to the number of flights - are unassailable logically but do not regain trust because the passengers are thinking about sitting in a seat knowing they are going to die in the next few seconds and being unable to do anything about it. They put this in the group of hazards that may be very low risk but which are totally unacceptable. As alluded to further up-thread, the GW event also means that had he wanted to he could have flown on and chosen a town to crash into - so the locked door actually allows another 9/11.
The point of this post is that glib - its the SLF/management/politicians/regulators not understanding or making knee jerk reactions and it's not a problem ... miss the point entirely. I think that this crash is going to have a big effect on the industry. So, it is essential that sensible decisions are made but the professionals will not be there to help that decision making process if they abstain from it because they don't realize how far reaching it could be and that they cannot stop that decision process happening that will affect everyone in aviation especially front and rear crew.
I think that Lubitz was right when he said his actions will change aviation. Think about perception and trust and be there to make sure the changes are sensible from that viewpoint too.