Dick,
We all know that GA movements around Sydney are only a small fraction of what they were 30 years ago.
(Schofields Flying Club never added much to the total in 1983 when I learnt to fly there. For the club then only operated on weekends. They had six Warriors and a Decathalon, some of which were sometimes flown to YSBK on late Sunday afternoon for hire there during the week.)
So what is the point that you are trying to make? Surely nothing to do with MDX?