Business traffic from Cork will continue to fly to the US via LHR, AMS and MAN.
The best EI long haul can hope for is leisure traffic from Cork punters willing to take the motorway to Dublin or take on the drive to Shannon which is an ordeal in itself once you are north of Mallow to the county boundary
Hopefully one of the US airlines will take a chance on Cork in the coming year. American Airlines is probably the best bet given they seem to be the only major long haul US airline who does not already fly into Shannon.
American Airlines are more less US Airways and AA now only have two remaining B757 routes to Europe from the US so not much chance of them around Cork anytime soon.
Your right about Business traffic using the current European hubs available but plenty still use SNN/DUB.
Don't hold much hope for EMA to take off again, unless FR are on a deal with ORK.