The A380 is a fat, fuel-guzzling lump of plastic that would only make money when it was close to full so it’s no surprise that it won’t fly for a while.
However it owes Qantas little financially unlike the 787s. Why else would they have kept the 744s for so long? At the end of the day it will or won't be returned to service on a total cost basis, not just how much fuel it burns or how costly it is to maintain. If it's overall cost is a dollar greater than any other fleet on any given sector, it will continue to gather dust in VCV.