Problem is that no airline with operations at SNN is going to take a gamble on ORK while they serve SNN. There are significant costs associated with opening a new route and any route at ORK would likely impact SNN to some degree. I dont see DL or CO/UA taking the risk on routes that they have been maturing over the years.
EI wont operate the A330 into ORK, so thats a non-starter too. Only hope would be an ORK-based start-up, which is also fairly unlikely.