Glasgow could make sense considering it is unserved from Cork at the moment.
However, Ryanair would respond to it. It might make more sense to simultaneously launch a number (Glasgow, Bristol, Newcastle and Luton maybe). It could give them marketing synergies and would make it more difficult for Ryanair to attack them with their single Cork-based aircraft.
Slight change of topic. Jet2 have increased the number of Cork-Newcastle flights planned for next summer from 4 to 5 weekly. I suppose it all helps.