Unfortunately this will be the first A380 write off, latest information from Airbus says that in order for the repair to go ahead both wings are required to be replaced, which blows the repair costs out of the water and makes it unviable to either Qantas or the insurers, also SQ are putting pressure on as they require the hangar that the A380 is in back for thier own maintenance requirements.
Not sure where the requirement to replace both wings is coming from, but I can certainly parlor-talk the possibilities.
1) I assume the airplane in question is one of the early-build A380s that had to have the wings strengthened following the ultimate test failure. Airbus would have to replicate a wing it no longer builds. That is, they would have to build a wing with the old structural configuration, then add the bits to strengthen it. Airbus may have gotten rid of all the tooling to do that, and to replicate it for one wing would be cost prohibitive.
2) Why not simply put a current (permanent design fix) wing on the left side of the airplane? Good question. This could potentially create a weight and stiffness (wing shape in flight) imbalance. To correct for the asymmetry, the airplane would have to fly with control surfaces deflected slightly for the airplane to maintain steady level cruise. This hurts fuel burn, and you may wind up with an airplane that misses its performance guarantees.
3) The A380 is certified for both wings that are strengthened, and both wings that have the redesign. But not for one type of wing on one side of the airplane and another type of wing on the other. So they would have potentially have to jump through a bunch of certification hoops for an airplane that is a one-off. Very cost prohibitive.
Right then. Back to the petty bickering.