Assuming everybody wants to fly to Spain that is. The city routes we still have do well, OK some have now gone, but there are still quite a few, and Jet2 holidays and easyJet holiday have taken priority at NCL, so can't see either of them expanding to anything other than beach destinations.
Worst case,the Polish routes don't work, so they pull them and try something else. I'd much rather see that, and I'm sure the airport would rather see a little more diversity too, good for publicity. Far better than playing it safe and announcing a double daily ALC/AGP/PMI. This will get folk talking, more flights to Spain would go largely unnoticed IMO.