ryan2000, US are flying SNN-PHL this summer.
I think there will be some form of service ORK-JFK etc at some point in the future, with EI or not it remains to be seen. Connections from other EI services may be a big plus for it. America is a very big market from Ireland so there is surely some room for it. In fact, if 757 was kept on SNN summer services then I doubt a service from ORK would have very much impact on services from SNN. Lack of preclearance may put some off though.
If it were to be a legacy carrier then it would certainly be UA as they love regional flying in europe