Most of QF's international destinations are are in countries which are expected to have widespread vaccine coverage by mid next year and Australia will be seen as a safe destination. Having large parts of Africa, South America and Central Asia unvaccinated won't make much difference. Europe - USA travel could resume later this year with Australia added soon afterwards. Direct flights from the east coast to the US are possible and SIN/HKG will be safe stops en route to Europe.
Travel bubbles proved too fragile but vaccine bubbles might be possible.