Well, that has to be more of a problem with the seatmile costs of the A340-500 which hasn't turned out to be great.
Remember when you bypass a hub you reduce the miles of the trip plus the cycle on the aircraft so if the costs are anywhere near the same it is cheaper to bypass the hub.
If the A340-500's costs are that high it speaks VERY badly about the aircraft
Don't believe me Draw and 3 points on earth. Unless they are perfectly aligned youare a forming a triangle.
It may not have worked for singapore, but it might work much BETTER for singapore's competitors who would be bypassing singapore. In the case of singapore, they would be effectively competing with themselves.
Cheers
Wino