The main reason why Norwegian has gotten so popular in Norway is that when SAS insisted on doing long haul from Denmark and Sweden, but not Norway, Norwegian made a point that they would start longhaul from Norway and more generally take up the competition with SAS. SAS basically had monopoly in Norway at the time and had forced many other airlines in Norway out of business thanks to government financial backing and favourability etc. At the time, the Norwegian and long haul part of SAS were the only parts of SAS that had a surpluss and the surpluss from the Norwegian part, payed for the debt in the Swedish and Danish parts of SAS. Needless to say, Norwegians in Norway got frustrated with this. SAS Norway made the most money, but Norway got little in return for it. Sweden had the main office, Denmark had the main hub, while the Norwegian part got less and less. No long haul, the technical facilties wich was the best got moved from Norway, Norwegians were forced to transfer through either Arlanda or Copenhagen especially when going longhaul etc etc. In the end the hatred toward SAS got so big, that when Norwegian announced that they would take up the competition and promised long haul from Norway, they got very popular.
Norwegian might have to let go of the long haul part and maybe close all together, but giving up the long haul. part is most likely the part that the ceo Bjørn Kjos wants to give up the least.
But Norway is still problematic for long haul operations.. and DY are not really proving it to be a commercial success.
SAS has a daily EWR and 1-2 weekly MIA, but other than that, ARN & CPH are still much better for SAS for long haul. Denmark and Sweden are are focused around the capitals, where as Norway is much more spread out, and other airlines have entered the market. Especially KLM is a hard competition for SK, as they have a much more intensive network out of Amsterdam, then SK will ever have out of any hub.
Christmas greetings from Copenhagen