Trying to censor porn is like censoring 95% of the whole internet - They may as well ban it altogether
What worries me about this filter is that censoring porn (legal or illegal) is just the excuse - That's why they don't concern themselves with the widely reported inefficiency when it comes to preventing child pornography. The real purpose of the filter is to control information so that the Government can dictate what you know and what you don't.
Just as the leaked filter list showed some 'politically inconvenient' websites rather than illegal listed among the banned content, I am sure that over time more and more of these 'inconvenient' sites will be added on and soon you would end up with a China style Nation wide firewall.
Control of information is basically control of votes. The problem is that the Liberals are probably loving the idea too and can't wait to inherit it so there is no way of preventing this from happening or relying on the next Government to abolish it.