So we know that the internet filter is a wrong and terrible idea, but the government is going to do it anyway. What might happen once the Great Firewall of Australia goes up?
1. Daily leakage of the blacklist
Even before the filter arrived, ACMA's secret blacklist was leaked - multiple times - to Wikileaks. Expect it to go up on a daily basis. The people with access to it will also be those most likely to (a) oppose censorship (b) be able to get and leak the list and (c) know how to cover their tracks securely when doing so.
2. The Big Ban campaign
Anti-censorship groups are already lining up a lig list of technically "prohibited" sites to bombard ACMA with. The idea is that the more numerous and mainstream the sites that get banned (for example the Amazon listing to euthanasia book The Peaceful Pill), the more public opposition to the filter will grow, and the more workable it will become.
Find out more likely reactions here