As an Aussie living in the UK all I can say is, when talking about long sector times, what exactly are you suggesting as an alternative?
My family are traveling back home in August. MAN-KUL 14hrs, 5 hour transit, KUL-SYD 11 hrs = 29hrs plus entertaining two tired kids for five hours before going through the agony of getting them on board the next flight.
One 23 hr sector (Actually more like 21)? Where do I buy the ticket?