My sense on this is media flipped it - when it first broke the angle of some flights being cancelled as a result of crew "shortage" it was reported solely as some were friends and emotionially not fit to fly as oppossed to having specific fears (Paris 24)
LUth is having lots of labor problems - main line crews do not like Germanwings taking segments away from them. THey were striking last week and had a 12 day strike a couple of months back - so sadly I think this might be acting out stuff re labor and management and how much traffic Luth is giving over to GermanWings, possibly reducing mainliners flight times working conditions etc.
But the plane has had a history of fly by wire taking control away from the flightcrew - its sister maiden flight crashed into a forrest on its worldwide debut flight in front of the entire world on its rollout
And in pondering the stable descent (relatiily) in conjunction with forward speed being consistant it certainly sounds like a computer thinking it was flying an aircraft in a someone "logical" manner!
kinda thinking explsive decompression, (possible cockpit incapacation) followed by computers getting bad info and taking control . NBC reports it was the cockpit voice recorder as oppossed to the data recorder but I have not heard any one else speicifically stating which recorder had been found
More on there ongoing labor issues directly related to LUth and Germanwings
http://www.usatoday.com/story/today...lots-plan-to-strike-again-on-monday/17548481/