Following on from OzBusDriver above, if there is a close near miss by a heavy RPT and a light GA and the GA aircraft loses control in the wake turbelence and crashes, the heavy crew would be blame less, because we are not aware of any traffice other than IFR, or would one expect the amateur aviator to don the accident investigator cap and pronounce that it was the RPT's fault because they should have seen and avoided the unknown light aircraft, ATC because they were looking the wrong way, or were busy seperating aircraft in C airspace 300 miles away.
Its all great in theory, but in practice, it will not work, and the snake oil sales men will vanish well before the body count begins.