It appears that Home Affairs has been sitting on Citizenship Applications hoping hope against hope that the foreshadowed changes to the Citizenship Act will eventually make its way across the line.
It appears that the backlog is now running at 120,000 unresolved applications. (as at April 2017)
At some stage the delay becomes unreasonable and there is good judicial authority to the effect that an application arguing unreasonable delay can be made in the Federal Court.
http://www.judgments.fedcourt.gov.au/judgments/Judgments/fca/single/2016/2016fca1530
I am of the view that the fact of Home Affairs "sitting" on applications in order to apply the 20 April 2017 foreshadowed changes is completely unacceptable and is imposing hardship and significant disadvantage to would be Citizens.
In addition there is no proper legal basis for this tardiness.
I think a delay of 2 years is prima facie "unreasonable".