Dick,
They're not disputing the ability of radar to provide service and reduce the possibility of an error chain producing an accident. They're worried about cost.
Nobody can dispute the value of radar, you have to prove in cost analysis that it would work and be affordable in the way you describe.
In the case of Port Macquarie, you would disappear as soon as you went below Middle Brother Mountain, just South of your old private strip at Kew.
The value of radar seperation would be lost during the approach phase of flight.
Are you suggesting we use build radar repeating stations? Use satelites? Open new radar rooms and primary radar facilities? I don't know if I quite follow you on this idea. I like the ADSB one better.