If and when Boeing's commercial line goes out of business, the issue will be one of predatory pricing; that is, a competitor (Airbus, here) selling a product at a cost lower than production. If such a player has deep pockets, he can force the other out of business, and then recover his initial losses (and more) by the monopoly power he'll then have. That's basic price theory.
I've heard from several Boeing customers that Boeing was insufferably arrogant and brutal to deal with. I'd be interested in knowing if others have heard the same thing.
Although Europe is a quasi-socialist economic block, the intrinsic inefficiencies of socialism and centrally planned production might not be any bigger than the unbridled arrogance and hubris of American companies. It seems that, no matter where you go, people worship bureacracy in one form or other, eh? The U.S. is almost as socialist as Europe anyway, and, given that most Europeans are at least literate, and most Americans aren't, I'd be inclined to guess that Airbus will continue to increase market share.