more comments from a non-specialist:
1. F/C shouldn't disappear but should be improved and this applies to the rest of the classes. GF's F/C is now Oman Air J/C (if i'm not mistaken as they just revealed their new cabin interiors), and its j and y cabins are way behind the other airlines in the Gulf. As I said before we should what and see the new interiors which will be designed by James Park (hope that they will choose the right colors this time, the colors which are used in the economy class cabin are horrible; grey and turquoise for the seats and gold for the carpets.... lots of colors!). Or GF should use the Virgin Atlantic model: (if f/c's aren't profitable enough) A super jc + premium economy+ regular economy.
2. Sin and HKG are good destinations to operate to as long as they are profitable. GF can consider reopening these destinations but through indirect flights for ex. it could do bah-kul-sin or bah-sin-kul, as both destinations are near each other, and there is good traffic between both cities. The same applies to hkg GF could resume its flights to HKG via BKK as it used to do before, i remember these flights used to be full during the festive seasons (why did GF end its services to HKG? Was it not profitable for them to go there?)