virginblue
As far as I know the financial risk for the Aer Lingus Regional route network is largely with Stobart Air. There may be exceptions where it makes economic sense for EI to ask EIR (STK) to take on an existing route but others here perhaps have the definitive answer.
What I would say is that the original plan, in 2014, was for the SEN routes to CFR, RNS, GRQ etc. to be operated under the AER brand but for some reason this did not happen and the deal was then done between STK and BE which currently expires at the end of May 2019. Maybe whatever precluded the EIR deal going ahead four years ago does not now apply and we could see EIR branding on the SEN routes. Definitely the uncertainty over the future of these routes which currently exists needs to be resolved as quickly as possible.