The problem with Cork is that there are only so many routes that can be made work. Munich didnt work for Aer Lingus, for example. The future for Cork is x2/x3 weekly flights to eastern European destinations which have a strong 'City Break' and ex-pat potential. There is also a strong market for flights to England and the main european citys. Along with the usual charter destinations. Finally a small number of trans atlantic routes could work, eg JFK BOS and MCO.
The only German destination that could work would be Frankfurt and there would need to be a healthy relationship with LH for that to work. FCO, WAW and PRG all worked because they csn serve both markets. German cities, in general do not have a strong ex-pat potential nor would city break potential be strong.