You mention Oslo and Milan (or Moss and Bergamo to be more correct
Regarding Oslo and Norway as a whole, During the 80s and 90s Newcastle had long established Daily (ex Sat) services operated by Braathens B737 to Oslo, and a daily (ex Sat) B737 service to Bergen via Stavanger. until Braathens was absorbed fully into Scandanavian's (SAS) network.
I would like to see Norwegian (NAS), which originally took over some Braathens busy bee routes on Braathens behalf in the early days of NAS before Low cost operation model. return to provide a strong Nordic link which may lead to further expansion.
More operators can spread the risk, introduce new routes, and encourage competition.