There could be streaming capability to the ground
Because never in the history of the world has any such capability been abused.
In the case of Germanwings, ground control would have been able to see what's going on once they detected the loss of altitude.
And then do what about it? Collectively praying that FSM picks up the plane with his tentacles?
t stifles me that in 2015, a young troubled copilot can end 150 lives in a way that can easily be prevented with simple technology.
Technology is not a panacea. Add one thing to make flying more safe (locked cockpit doors), create another problem without which a catastrophy could have been prevented (locked cockpit door).
Something I learnt in my first leadership position: When someone has an idea, ask them about the downsides and potential issues. If they can't think of any, they haven't thought it through enough.