There will be no savings. Whatever option/plan eventually occurs will cost money.
1. RAAF App to civil centres = spend money
2. RAAF/ASA new ATC machine = spend lots of money
3. Complete ASA takeover (highly improbable ) = spend truckloads of money
4. Re employ RAAF/APS ATC that dont want, or get a job with mega ASA as a result of option3. = more money (VR hopefully)
Please remember that all of our great ideas that we come up with at the console when its quiet, don't always make it to CEO level for implementation. Most ATC's actually talk out of their arse. We are simply employees.
If there is any cost savings to be had, it will only ever exist in some bean counters or spin doctors head !