Dick,
hardly anyone actually gives the scenario of what particular accidents we are going to reduce.
That’s what "a few uninformed and closed minded" (from your CTAF post; thanks) "experts" think. Get onto 133.5, 133.8, 127.0 and the Low matching freqs (the Pilbara and Goldfields for those of you in the East) one day and listen. Nose to nose jets, off-track diversion radials, fuel wastage, blocked comms, not to mention 30 minutes traffic holding at Perth, and more. Open your mind and ears, listen to what people are saying and perhaps you may see that ADS-B would be a god-send in some parts. Perhaps not in Terry Hills, but for other places it would be a huge benefit.