I can only see WestJet and JetBlue from that list being at all possible and JetBlue very unlikely. Air Canada Rouge may be another airline to throw in the mix though.
The blow to Cork will be largely psychological, losing the only TA link. Passenger numbers were likely to be a total of around 1% of airport passengers next year. This will be much worse in Shannon, where Norwegian represent about 5% of total passengers. Shannon is more likely to pick up replacement carriers though.