Surely Govt, BAC, ATC (whoever is doing the ass covering) could get parallel runway ops back by putting something into ERSA like 'No go-around available RWY14 during parallel ops' or similar.
I believe the problem is that neither BAC, ASA or the airlines are prepared to accept the liability in the event of it going wrong, so the whole thing's sitting in the limbo tray. As we're all well aware, what's done in the rest of the world doesn't necessarily get done in Australia.
The Cirrus pilot didn't follow the missed approach procedures anyway, hence the close encounter. If it had done so, there would have been no incident.