I've been able to leave my home this entire pandemic. What are you even talking about. And given how badly the rest of the planet is handling things, I wouldn't leave Australia even if I could (though we can visit New Zealand, which is pretty nice this time of year).

("If the vaccines don't work" is a pretty big if given we have a plethora of evidence that they are effective. You can't "what if" yourself into a reasonable argument.)