Since SQ have had the sense to give only Y+ seating in the SLF zone on SIN-LAX and soon JFK, that may just give QF the kick in the @ss to do the same - had they considered SYD-LHR non stop. But then again, why bother - just give the cabin full of 3rdWorld+ passengers to BA and make the other 300 in QF Y- happy they are only squeezed into 31 inches and not the 30 inches in JetStar.
(somewhat convoluted response - but its late..)