In reply to the original question I don't believe they will. US gateway airports are in competition with each other to provide the feeder services in and out of smaller airports. The revenue from a plane load of A380 pax vs B747 is going to be greater and I would think higher landing fees will be charged.
I would also suggest there will be some prestige to be had from having A380s at your airport or in your fleet so eventually, the US majors will return to financial health I can see one or two of them making purchases especially those airlines with extensive Airbus fleets at the moment.