Scoot seem to take a fairly cautious approach and have operated Berlin-Athens-Singapore for a while so I imagine they must know how double drops affect yields.
I flew them years ago from Sydney to Singapore and they were fine.
The prices look good. £600 premium economy seat return to Bangkok will do alright and the back end will be busy with families, Backpackers and students.
There is less competition now too. BA has gone seasonal to BKK and rumours it will drop it altogether.