This is ridiculous.
How often in Australia do we find products that claim to be kosher? Most products don't have kashrut symbols on them, and are just listed in a book. Are we really worried that a marketer might say something is kosher? If that happened, the community would be very quickly informed of the lies without the need for government intervention.
Are you really scared that Food Standards Australia will mandate what is kosher in the future if you don't now? They are not concerned by such claims. Just look at how many times they pushed back requests for standards of vegetarian and other religious labeling.
You mention the importance of "our community is unable to achieve a consensus on the details of a regulatory system". What makes you think that it is important that we reach a consensus. 2 Jews, 3 opinions. People do or don't follow the Eruv here in Melbourne. Around the world each person has different Kashrut organizations they do or do not trust. I do not think I should have the strictest strictures of "Kosher Australia" foisted upon me and I don't think the community should be forced to follow these rabbis which they themselves don't necessarily trust.
I would think that that ORA would forced glatt and other "mehadrin" ideas that would drive up the price of kosher food making it less available. There is more than one way of keeping kosher, and ORA admits this. There are Halakhic disagreements between different supervising businesses in Australia. However they represent a very narrow band of the spectrum of what is acceptable, and they should not be allowed to legally dictate to Australia's Jewish community what is acceptable to them.