I think we need to define 'opening up international borders'. IMO, I agree that they won't anytime soon and domestic freedoms will be focused on and 2022 will be about that.
If we consider the current vaccination rate, and the fact that Moderna comes onboard next month, along with more Pfizer supplies, 80 - 85% should easily be hit in November. Unless some unforeseen supply issue occurs, there should be no reason not to reach that. If that does occur however, what next for international borders? Realistically what next that is?
Because 14-day home quarantine is still not feasible for many people. What about those of us that don't own a home in Oz, but want to spend 14 days where others are in the house? Will that be allowed?
Australia is so far behind that I don't feel any of this (intl. border opening/rules relaxation) will even be discussed till mid 2022. They'll focus on domestic issues, then have countless "trials/studies", then they'll discuss it 1000 times and then who knows we may have something by 2023.