Maybe somebody should ask how Moorabbin survived with three runways in operation and twice the traffic back in the 70s/80s. Must have been the early model ADSB and ACAS. There was also times with contra circuits in operation on 17 or 13 with crosswind operations on 22. Moorbbin movement rates have not changed much in the last 20 years, sitting around 250,000 movements a year average, so nothing is 'new' in this airspace.