I am personally not too worried that Ryanair didn't choose NCL as a base as I believe it would have a negative knock on effect on the other airlines based here; however I fail to understand how they seem totally unwilling to fly TO NCL from their current bases. There is a market there, perhaps not for daily flights but at least 3 or 4 rotations a week.
BGY was successful despite shocking timings, and I understand the route was cut as they wanted to send the plane to Manchester instead. NCL is still massively underserved when it comes to Germany and should Ryanair ever open a base in Eastern Europe then any route planner worth his or her salt could see that NCL could justify a few flights a week.