SIA make large and consistent profits in Singapore. Where they seem to fall down is investing in foreign ventures run by others. Possibly they might decide to be more hands on and send in their own people for the key roles next time.
Future fleet size is dependent on the game plan, 30 - 40 aircraft gives them another Virgin Blue whereas 60 - 70 gives them a serious sized airline if they want to replicate Virgin without the loss making areas. When WOW Air went broke last year its aircraft were soon snapped up by other airlines, now with most of the worlds airliners parked up, leasing companies will be very receptive to anyone wanting their aircraft, and not in such a great hurry to fly them all the way back from Australia into storage.