In response to the original question, who's to presume the Americans will have such a big say in the future of commercial aviation advancement.
One shouldn't compare the A380 to Concorde, Concorde was a medium-haul airliner and it's true niche was the transatlantic market, it wasn't any good for flying longer-haul nor over land masses.
The A380 is a different kind of airliner and very suitable for Europe to Asia & Australasia etc. If the USA, for one reason or another, don't want to provide the appropriate ground facilities then I'm sure such airports as SYD, HKG, SIN, KUL, BKK will be only too willing and the USA may find itself being left in the dark ages.
Sure, in the 60's, 70's, 80's etc. USA might have led the airline world with Boeing, McD and to a lesser degree Lockheed but things have moved on. It's more or less Boeing vs Airbus these days, who will win, well only time will tell!