And to add to it all...
They really believe there will be sufficient people who will pay more money to be 2 hours earlier in Japan to support some 500 airframes? Dream on boys, but that will NEVER happen. How many people do you find who are willing to buy a ticket at 10% more for HALF the time to cross the Atlantic? It used to be sufficient for TWO flights a day!
For any other resoning over speed and where it ends to be a commercial factor, read the following:
R.E.G.Davies; Fallacies and Fantasies of Air Transport History; 1994 Paladwr Press: ISBN 0-9626483-5-3
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There's nothing like a three-holer...