At one point ORK-MAN had 11 BMIBaby 737s a week, plus 7 Aer Lingus A320s.
Now, it's just 2 ATR 72s a day.
For airlines now, it's all about yield, not providing cheap fares to customers.
If Aer Lingus were to consider launching a route to Knock using an A320 doing a W, it would seem more likely for a hub connection like AMS or CDG. Seeing that Knock doesn't have a hub connection yet, there is probably the potential to extract some decent yield there.