Maybe this is yet another incident that emphasizes the need to evolve from plain VHF radio technology for digitial voice transmission. Public key encryption and signing would at least provide a way to identify the station calling safely (at least until quantum computers are in town) and rule out any prick with a transmitter from potentially wreaking havoc for the foreseeable future. Just to be clear, the encryption part would not be used as much because one would still want to enable other pilots to keep a listening watch but the signing part would allow any aircraft to verify the identity of the station calling.
Here's another thought: Not that I want to revisit the issue, but as a former baggage handler, this bloke certainly had an ASIC, hence a background check, thus proving yet again how useless this piece of plastic is.