Stockholm was doomed to fail. Sadly SAS certainly haven't helped the route. It's flight times in an out of Birmingham have constantly changed, as have its days of operation, it was initially timetabled as a 737-800 6x week far too much capacity then 736 then 717 and it had several breaks summer and winter so no surprise there. A real mess. A CRJ-900 would have been perfect with the loads achieved but I think I am right in saying that SAS don't base them at ARN? Perfect route for an 88 seat Embraer Jet.
Berlin may be the political capital of Germany but not its industrial powerhouse so apart from leisure links there are probably few industrial links with Birmingham.
Lufthansa at Birmingham did operate to five cities, now its three. I fear Germanwings HAM will be next for the chop and Im sure DUS will suffer too in their hands.
