Re decoupled sidesticks and possible involvement on AF447 and AirAsia, it was already mentioned in this thread the new G500 and G600 will have "active sidesticks" which are electronically coupled.
I just saw this brief video that explains it:
https://www.youtube.com/watch?v=vXhCJYWvwd0
The system is made by BAE. I wonder what the cost/risk/complexity would be to retrofit this to an Airbus?
Commercial Active Sticks - An Active Role | BAE Systems | United States
However this FlightGlobal article says BAE has no plans to offer it as a retrofit option:
https://www.flightglobal.com/news/ar...-aircr-411455/