I didn't take the Sydney in '91 bid seriously, and I don't think anyone else did, either. The point is that any serious bid -- and just filing papers is clearly not enough to be serious -- for Australia seems to be given a lot of slack from SMOFdom.

Of course, if the existing Australia 2010 bid hadn't done at least a minimal amount of effort to keep their name before the electorate, then someone would have stepped up with a rival bid lest we end up with no Worldcon; however, as long as Australia 2010 remains on their current course, I expect them to remain uncontested.