It will be fantastic if GSM does come to SYD (and other cities in Australia and NZ - there are more cities than just SYD). GSM would want to find a couple of 777s to fly non-stop from GLA/STN to an Asian transfer point. Then put the pax onto a like minded Australian/Kiwi carrier to get them to their final destination.
(Is anyone good with a paintbox, to do an artists impression of a 777 in GSM colours?)