Realistically, I can't see the A380 ever returning except for a small number in one or two airlines on a handful of routes. It's the modern equivalent of the Concorde. Airlines are pruning their fleets of older, inefficient and 4 engined types, even early A320s are being scrapped. Once air travel starts to return, B787s and A350s will be first out of the gate, CX have pushed the B777 - 9 back to beyond 2025 and even their current B777 fleet isn't looking good.
It would be very hard to make a case for bringing the aircraft back into service and operating it in comparison to newer twins, QF might not have the critical mass required to make it worthwhile if it could only be justified on a couple of runs. Even the few airlines which continue to operate it may have to look at reducing the size of the premium cabins.