its fairly simple...
1. Stop polluting and devaluing .com.au and enforce some standards
(e.g. checking that owners have a ABN)
2. Do some actual research into the .au domain space
(R&D is tax offsetable but requires employing smart people might help with point 1. )
3. Secure the .au domain with DNSSEC so that when you visit a banking website you have a good chance its verifiable
(see the .nl domain process )