[I fly from London to Australia non-stop
Will take 17 hours to Perth making it the worlds longest non stop route.[/I]
Well that's alright then. They'll lobby the muppets at EASA that there is a strong case to increase FTL's to make this economical. They could use a 'dispatch crew' to reduce check in to 30mins. They could then include a bunk behind the flight deck with a panic button for the 'on watch' pilot. C.A's would keep an eye on the PF to make sure they're awake. PM is napping & then they swap over.
Perhaps 2 hours discretion will be required, but hey, that's the norm, no? To avoid jet lag the crew will decamp into airport hotel, eat, sleep, shower, eat again then after 15hours total rest be on the way home.
Job done. Never say Never. Inspect the rosters from decades ago & now. Money talks, no shouts.