What is the "nonsense", Capn B?
In order to provide a rational solution to a problem, one first has to identify the problem and the causes of the problem.
The problem is the increased risk of mid-air collisions near aerodromes compared with other phases of flight.
The cause of the problem in this case was not inexperienced GA pilots. Nor was it insufficient two-way communications.
The 'solution' is to do what the rules and good airmanship have required for around 100 years.
IMNSHO, and based only the ATSB report, the pilots of XGY and XGA failed to comply with the requirements of the rules and good airmanship. Aircraft attempting a straight in approach v aircraft completing a circuit? No rocket surgery working out who was obliged to give way (a "wide berth") in that situation.
I was merely making the supplementary point that if the assumption is that GA pilots are not going to comply with the requirements of the rules and good airmanship, there is only one, inevitable, solution. Even that solution is no guarantee.
If you think about it rationally.