One interesting possibility here would be if Google closed down all Australia-based operations -- no more offices, no legal presence, no employees -- and offere

One interesting possibility here would be if Google closed down all Australia-based operations -- no more offices, no legal presence, no employees -- and offered its services to Australians purely over the Internet from somewhere else. At that point, Google wouldn't necessarily be within Australia's jurisdiction any more, and all Australia could really do would be either attempt to block access to Google services that was desired by its citizens (and look like China Lite) or attempt to exert some form of leverage on the host nation(s) from which Google was then offering its services (and since that list would presumably start with the US and possibly be followed by lots of places that want to do business with the US, good luck with that one).