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a Cork-Shannon-New York service would probably be fine since EI used to operate US-Shannon-BFS some time back.
However, a Cork-Dublin-NY service would be interesting and make (very slightly) more sense than flying 100km ORK-SNN, with RE reducing service to 3x and FR coming in - a 330 Cork-Dublin early bird would allow some bullying of FR for a change
It will never happen though as you would have to overnight the 330 and for what? I'm a Cork man through and through and I just don't see the demand for flogging a 330 that way, and EI don't have something smaller like a 757 or 310 to do it.
That said, I wonder if DM will consider re-introducing 320s on ORK-DUB with RE retreating to safer pastures on IOM to provide greater interconnection with current and future DUB services...