What would be great would be a £200 ModeS ADSB based system, which would give everyone the screen that the Hawk T2 rear seater has. A fully dynamic display of what the aircraft you around are doing.
That's not going to happen until we all transmit gps data all the time, and the big problem is that where it is needed most, which is <3,000 feet is normally not transponder mandatory territory.
Maybe someday.