PHX is a hub for them and unserved from Dublin. It would need to pick up significant connecting traffic to be viable.
There's always background chatter about La Guardia dropping its perimeter rule. With pre-clearance, Dublin would be the only European hub that could operate flights. The short runway probably precludes it though. I'd note that it's very similar in length to Cork's runway and Norwegian said that was too short for 737Max flights to SWF, so other than the fact the short runway is on the western side of the Atlantic, it's not easy to see what would make it more suitable for Transatlantic flights. Anyway, the last time that background chatter turned into something more serious, it didn't happen, so there's no reason to expect anything imminent.