I don't think 80% of Aussies will take the vax. I reckon more like 50% As far as I can see, 50% would be perfect for the following reasons:
The vaccine is classed as experimental in the USA and is released here in Aus under an emergency authorisation.
The vaccine was rushed to market in record time and the usual long term testing and animal trials were skipped
The manufacturers and the government plus the doctors and nurses are all indemnified from any liability regarding the administration of this vax
The vaccine itself is not without its risks and the long term effects are unknown
If 50% of Aussies take this stuff we are setting up the perfect and much needed long term trial that is needed. In 2, 5, 10 and more years we can look back and compare the halves.
Perfect clinical testing I reckon :-)