When you look at the figures for Bankstown, yes it is in serious decline.
But if you take into account the traffic at Wedderburn the figures probably aren't quiet so bad.
Notwithstanding, BAL are their own worst enemies, instead of being pro active to aviation they actively go out of their way to discourage it.
Most of us laughed when their foray into property development in the SW corner failed. I believe Star Track took notice of the disgruntled BAL tenants and pull out of the development.