Actually what killed Concorde was the Paris crash. If I remember right this was caused by it hitting some FOD which had fallen off a DC10 on the runway. Confidence was lost, in France in particular, as the accident report was critical of some AF practices with regard to maintenance (tyres in particular) if my memory serves me right. BA however modified its ac after recommendations to imrove the fuel tank protection and some re entered service. Unfortunately Airbus, the DA for the ac, decided to stop supporting the ac as AF decided to retire its remaining Concordes and Airbus being mainly French led weren't interested that BA ac had a good 10 years service left in them and BA wanted to still fly this magnificent ac. Sad thing is after the USA tried to ban the ac in the end we gave them one for a museum!
Anyway the A380 will not be scuppered by the USA as there is a lot of US equipment in/on it and as already been pointed out FedEx have purchased the ac. Sadly the Americans love to shout Airbus are subsidised as Boeing now has competition, but if they take a good look at themselves they'll see Boeing are subsidised by the US government too(KC767 et al). The main thing is competition is a good thing and both companies produce good ac. Long may it continue.