Going through the list,
Carlisle - Belfast
Carlisle - Southend
Carlisle - Dublin
...are not really dead. Stobart has announced that they still plan to start them:
Passenger flights from Carlisle Airport 'by this time next year'
Edinburgh - Oxford,
Norwich - Newcastle
...were both auggested by Links Air which is now bancrupt, as I understand.
Dundee - Amsterdam
Leeds/Bradford - Newquay
Norwich - Exeter
Southampton - Munich
Southampton - Lyon
...have been launched.
Derry - Dublin
...is the only definite non-starter. We have not heard from Citywings what the reason is.