But in the YMIA incident would ILS or WAAS made a great deal of difference??
You are completely correct.
But I think we both agree that the focus should be on the failings in aviation infrastructure rather than pilot's decision making or fuel reserves. Cat III in Adelaide, WAAS or ILS at Mildura or better forecasts would have avoided the whole situation.
And by the way, lets not forget that there is still no radar coverage at Mildura.