It's finally dawned on the Mint that the 50c is inconveniently big and clunky:
http://www.abc.net.au/news/2016-02-...27s-50-cent-coin-set-to-be-considered/7164778
http://www.abc.net.au/news/2016-02-...27s-50-cent-coin-set-to-be-considered/7164778