Reading between the lines, the govts and other authorities seem convinced this was a criminal act, so IMHO we can definitely expect some changes to the satellite tracking systems so they (a) transmit the position (i.e. the airlines will have to pay up the fairly trivial amounts involved) and (b) cannot be disabled from the cockpit or cabin.
None of that is technically hard. Maybe relocating some circuit breakers.
If this pilot really did what many think he did, it was a clear "go out in style" job, which some may want to copy. Let's face it, it is amazingly easy to do. Either pilot can do it if the other leaves the cockpit.