From here:
http://www.australianfrequentflyer.com.au/community/virgin-a…
Virgin Australia are going to remove the Saver Lite fares (Carry On Only) from all domestic routes on March 17. The press release doesn't say if normal Saver fares will go down or stay the same (or go up!)…but if I were a betting man, I wouldn't bet on them going down…
Note: I haven't seen the release myself and have not been able to verify it with other sources.
Maybe donga can give more info…