Dick Smith said:
They were not going to spend $100 million of their “savings” in subsidising GA aircraft.
Two aircraft in the circuit area at Windorah have the same chance of TCAS working
Clearly references to GA & class G airspace, but now we're only talking about the benefits of TCAS in controlled airspace??
Clearly the likelihood of a 10-30 pax aircraft (and anything else) having a mid-air is vastly higher in class G (particularly in your oft-quoted "terminal areas") than in controlled airspace.
So using your argument for TCAS to be most effective to those 10-30 pax aircraft, all in class G would have to be transponder equipped.