The loser in all this seems to be Lanzarote, which is currently showing at 1x weekly as long as EI allow future bookings. With the loads and prices charged, that had always looked like a bit of a cash cow, but with the long sectors, it looks like extra flights can be squeezed out of the aircraft by reducing frequency. Plus, Ryanair capacity increases on the route in recent years may have been hurting.
Not sure where your working that one out, ACE is 3 weekly for next Winter. Over all Aer Lingus are increasing both weekly flights and capacity next Winter.
Ryanair have loaded Cork-Santander onto their booking engine, although with no flights yet available. Seems to me it's highly possible FR want to go after the new ferry service operated by Brittany Ferries.