Track Shortener, this may sound strange but I am on your side. When you look at incidents involving CTAF or uncontrolled aerodromes it muddies the water.Benalla and Hotham come to mind. This incident is enroute with active IFR flightplans in the system. I am asking, is it possible for the system to be a bit more active using the data available? Otherwise Squawk7700 is on the money, look after yourself first, put in the tools and maintain your own SA...DTI breaks down with exactly this situation, one or both aircraft actively changing altitude in proximity.