Irrespective of the rights or wrongs of it all (and I have been accused of being pro all of it, which I am not) the fact is it is now the law. If you break it or refuse to conform to it, be prepared for the consequences.
I agree. If you want to make a stand against the scanners you would want to have a pretty good plan B and a lot of money. I would suggest it would be a constitutional challenge in the High Court or some form of OH & S issue which you would have to prove in court to get your job back.
Either way you would unemployed for a few years if you took that path.
Maybe a dramatic way to exit for those thinking of retiring?