The Greens only received just over 7% of the primary vote in 2013, less than their just under 9% country wide, and that was a large fall from 2007 and 2010.
Unless they improve their overall vote they will lose one of their two seats. Xenophon will almost certainly win three.
edit: the number two guy, Simms, is considered to be a rising star. They will be very sorry to lose him. I think if it was a country wide members vote he would have been number 1.