They could operate their SNN routes as Ws from Dublin, adding capacity to Cork. The fact that this isn't happening is a real sign of how far we are from Aer Lingus expansion in Cork.
It would be possible however I don't see it happening for a number of reasons.
1 - T/A feed on all key European routes and something EI couldn't afford to lose.
2 - The whole schedule is designed to have good freq to meet needs of passengers for many reasons. This doesn't really apply to Cork apart from UK and AMS services.
3 - A330/321/320 on FAO and AGP in the mornings and anything apart from A320 would be to costly to operate a W on. On most other bucket and spade route not many others operate in the mornings.
4 - Very little operational room for change without cutting at DUB something they don't want to do.
Cork Krakow was also generating City Break traffic from the Cork region before it was axed. Polish people are now as likely to switch to Dublin Krakow as travel to Shannon.
Agree unless there is a good bus service to SNN, they will pick DUB as most foreign nationals tend not to driver. FR may regret the move to SNN in time