I doubt in the traffic scenario around Gold Coast scenics that any ADSB info was going to be taken notice of.
How could an ADSB proximity alert NOT prevent this?
We just don’t have the tech yet to allow this. ADSB-IN has never been a focus for the government. Once the EFB’s put in the relevant alert algorithms with the audio routed through the intercom and everyone has an IN receiver, there would be half a chance. We are a long way from this happening though.
I’m sure the pilot would sit up and take notice of a loud beeping proximity alert came through his headset. Even FLARM would have worked well for such a small cost - it’s very suitable for such an operation.