twitter.com/davidriddel/status/1417803633823944706
I think Australians are going to HAVE to dump zero COVID at some point if they ever want to open their borders.
It does appear that Delta requires insanely high levels of population immunity in order to stop circulating. Very vaxed countries like Israel have largely seen off death and hospitalization pressures, but there are cases even there. LIkewise the UK, where over 90% of the population now has antibodies due to a mixture of high vaccination rates and a lot of previous infections, yet we're still seeing plenty of ol' cases (though few deaths). And Australia is about a million light years away from this kind of level! There is little natural immunity in the population and an awful lot of people are saying they don't want the vaccine either.
So if they want to open their borders in a normal friction-free-travel kind of way, Ozzies will have to accept that the virus is going to swirl around the country and that people might get sick from it.
If they can get REALLY high vax levels, they could manage "There will be positive tests, a few people will get noticeably sick and a very small number of deaths might occur." Now, I can happily live with that future, but if the whole population has been trained to see even a single case as a national disaster, it may be hard to get everyone to change their mindset just like that. Public fear isn't something that governments can just conveniently switch on and off like a tap.
And if they can''t get more than, say, 60% of their population vaxxed, even that is going to be a pipe dream.