There’s a 2nd tranche of non-sunrise A350s coming that WILL replace the A380s. So they’ll need a mix of sunrise and one stop to maintain current capacity.
Australian carrier to introduce Airbus A350-1000 on key international routes as Singapore and Los Angeles
www.airdatanews.com
Yes, they could swing those A380s off to other routes towards the end of life like they did with the last B744s. They’re already on JNB. No idea if SCL could support one and there’s been speculation of HND, but apparently there are limits for A380s there. Of course HKG has seen A380s also.