This would have been more suited to The X Factor, wherein the judges could decide after this segment who to send home, or if it went to deadlock (in the case of there being four judges), whoever was eliminated would’ve been determined by the public vote.
I’m also of the view that while the 2005 season of said show tanked on Channel 10, Seven capitalized on 10 axing Idol (citing declining ratings) in early-2010 and revived The X Factor, subsequently turning it into a ratings smash (what helped was the fact that they had, by then, become the number one television network in Australia in terms of ratings, though would only win 23/40 ratings weeks in 2010; this of course preceded a clean sweep in 2011).
Though like Idol before it, ratings started to gradually decline towards the end of its run and X Factor would be no more after 2016.