I agree - Dublin is very much in the acendency - particularly heading west. I note that Manchester was notes as one of the top 3 connecting points (albeit self connection). I have a feeling Norwegian might see the point to point strengths of MAN to the U.S.
MANs core long haul is heading east, building on and developing Emirates, Etihad, Qatar, Singapore, Cathay as well as the soon to start Hainan and Air China is key.
If China Southern also start the only obvious gaps in the market are indian, Thai, Malaysian and Japanese airlines. Some of those have fairly fundamental problems to deal with but I'd hope to see some of these in the not to distant future.