In other words, Ryanair could cut all routes from Ireland tomorrow and still be a fairly well functioning airline,
So the fact that a business is successful in more than one country is a bad thing and we should be deeply disgusted by such fact and we should praise companies who only have success in their own market.
I don't know how much business that has been studied by people reading this board, but I'd have thought that being active in more markets so you don't place your eggs in one basket is a shrewd business move.
Aer Lingus tried to expand into Gatwick and failed, but neverless, because they failed this makes them good, but because Ryanair succeeded this makes them bad.