Eh, if SQ couldn't make their 3 previous attempts at the Australian domestic market work (Air New Zealand/Ansett Australia, Tiger Airways, Virgin Australia 1.0), there's probably very little to zero chance of them making any 4th attempt (big or small) work.Because the very average airline that is Qantas would fold within 2 years.
There would just be too many Australian jobs at stake I’d imagine
Considering the AFR 'reports' that SQ straight up declined an approach from Bain Capital for a stake in VA 2.0 says it all for SQ's current priorities, the Australian Domestic market isn't really high in priority for them after losing billions on their previous three attempts.