You talk like Norwegian is the plague. I see lots of airports that Norwegian use and other airlines don't avoid those airports.
In economics, you have what are known as disturbers. Norwegian is a disturber. We need disturbers. Easyjet and Ryanair were disturbers in their time. Now it is Norwegian. The big airlines organised life so that we usually had to use their hubs, very convenient for them, maybe not so good for us. Maybe Norwegian, with a better sized aircraft, will give Bfs a better selection of routes. Not all pax want to use a routing that suits the airline more than the paying passenger. Some will pay extra to fly from Bfs and avoid the road trip to Dublin. What is clear is that Norwegian are starting to pose a bigger threat to the big boys across the atlantic, especially if they start to fly even more direct routes between smaller cities. It could have an impact on hub operations, not what the big boys want at all.