In my view...
We need agreement on a single system or full compatibility across all systems.
We need legislation to make the carriage of a working, switched on unit in EVERY airborne vehicle, including gliders and paramotors absolutely mandatory. NO bimbling about in your non-electric Cub or SSDR etc without being fully visible electronically to the rest of the World.
However, are we sure that the carriage of such a system by both aircraft would have prevented the mid-air collisions in the past few years? I'm not so sure...
TOO