Don't forgot, vaccination is but one weapon in the armory. As time passes we will learn more about the virus, it's virulence (and whether it will decrease with time) , there could be better and more effective testing, and not forgetting the possibility of improved treatment regimes. Couple that with some risk management (NZ, Taiwan and the like), you could start opening some borders gradually, hopefully soon. Will Australians be travelling to Europe and US by March next year? I doubt it. I'd like to hope that travel to NZ and between Australia's coasts, could be normalised by then, and other lower risk places (in SW Pacific and parts of Asia) soon after.