Griffo,
Purely to play devils advocate...
I think the jury would still be well and truly out on FS did it cheaper. Yes on a dollar per man hour that is true. But there are only 8 truly low level sectors left in OZ; and some of those have up to FL245 or FL180 with E airspace above A180 or A085 respectively. These console see stand alone time for about 4 hours per day, and are hardly catered for in the staffing coverage numbers. So nearly, not quite, but nearly no ATC is dedicated for duty to cover the FS role... So perhaps it is cheaper integrated.
A good idea, a better service, well we probably fully agree there. Mind you it easier to change airspace when it's just the one system; try and do that with private ANSPs.
Will be interesting to watch this all unfold, I doubt there will be any real change anywhere near a console; but hey I've been wrong before.