Despite some great work, this isn't going too happen. And here's why;
--> We, merlion Virtual Airlines, already operate Boeing 777-200ER, Boeing 747-400, Boeing 787-8 and Airbus A380-800 on our extra-longhaul routes. Adding the Boeing 777-300ER is not entirely worth the money. Especially if we sell our 772s at 85% original value. (thats how we work it when we sold our Airbus A321s and Avions Transport Regional ATR-42-600s.)
--> We also can not just introduce an aircraft because of its merits in-sim. Furthermore, now that merlion Virtual Airlines is cross-sim, we can't just introduce it willy-nilly. As it may be fantastic in FlightGear but absolute horse dung in FS9, FSX and X-Plane.
--> In real life, apart from the stretch of the aircraft, there's not too much different in the aircraft, they're too similar. Going through an overhaul really is NOT worth it.
--> We've just complete merlion Data v3.0, we really don't want to have rethink all 777 routes, there is a fair few.
Hope you understand.
Cheers,