Bethune should remember that his SC will be at the same Flight Level as the A380 and won't necessarily be able to go faster without taking a longer route.
Anyway, here's the thing about the SC: the time saved by cruising a little faster (it won't queue on the taxiway faster, nor will it's passengers get from downtown to the airport and v.v. any faster) isn't enough to justify a higher fare. Therefore, the operating costs need to be the same as a 777 or A380. If the costs are higher, it's not going to work. Period. It's not like you're cutting the total flight time in half. More like 5% - 10% (as I said, taxiing, holding, maneouvering, even initial cruise etc won't be any faster).
And I don't care what nationality the subcontractors are, especially Japanese - half their major banks are trading insolvent and Japanese involvement guarantees nothing. Subcontractors don't fly airliners and the airlines of the subcontracting countries aren't going to fly a plane which will lose them money.
I personally think the SC will not happen unless the costs (especially FUEL) are less than (at least, the same as) a conventional aircraft. With what's going on in the middle east right now, fuel prices will take a big hike and probably not come down again, political solution in Palestine or none. The more fuel costs, the more important efficiency becomes. Hey, airliners used to cruise at near-SC speeds until the oil crisis of '73. Then all the airlines had to calculate what the most efficient speed was. My Dad said long haul flights got an hour longer almost overnight. We could go back to those cruising speeds now (the 747 is of that era and can move faster if it wants to) but it doesn't make economic sense for the airlines. Nor will the SC.
PS As an aviation enthusiast I would love to see it fly and hitch a ride, I'm just looking at it from a business point of view.
PPS I don't give a flying shit what effect (none, btw) the SC will have on Singapore Airlines' traffic between Aus and Europe. Bloody SQ? They'll survive, don't worry about that.
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz