I know spar repairs are a big deal, but they do happen. Qf have in the past performed spar repairs to 747s when they had heavy maint in Sydney.
No doubt this is the first time is will be done to an A380 but realistically it is not over the top of what can and can't be done.
They also wont be replacing the wing, if they did choose to do it they would need to change both as any new build wing is a newer mod status to the wings already on it. Having 2 wings of 2 differing mod statuses and strengths would no doubt cause problems of its own.