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If they were to adopt this as the only option I think I would think twice before visiting Australia and my sister lives there. I would rather go through the slower "old fashioned" methods of security than subject myself to this type of intrusion.
These scanners have been around for well over three years now. The image they present to the screener is one that would force the women and men passengers to be separated into different lines. You would have to make sure that the screeners are of the same sex as the screenee. Otherwise you will be risking a law suit. The image is very detailed. I would hope that further studies are done on this. I would like to see a screening point like the one in movie "Total Recall".