A few points.
The old ansett terminal is set up for one airline. It is not equipped to handle multi users. That is the modifications that the new owners are talking about.
The 'old' SACL was told by the new owners to cease negotiations on a deal for the AN terminal, as they would do it. A resonable business decision I would think.
Virgin refused use of the Ansett termainal sometime ago ( about 6 months) as they were only interested in exclusive use, not sharing with QF. And they didn't want to pay the price.
Last week (I think it was wed or thurs) a Virgin flight from ADL spent 1hour and 31 minutes on the taxyway at SYD, because there wasn't a bay for the acft!!! Longer than the actual flight.
Virgin until now has refused to bus pax onto acft on standoff bays.
I think that the predicament they are currently in is not entirely of someone elses doing!