Corks service to Amsterdam has lost alot of yield lately, hence they made a commercial decision to cull the Tuesday evening flight for the winter It's not that concerning, however this plentiful attitude of everyone is against Cork really doesn't achieve anything and is completely detached from reality.
Dublin now has 3 carriers, operating 12-13 (I think) daily flights to AMS, more than doubled compared to what it was previous to the arrival of Ryanair and KLM to the route. As a result, this dilutes yields in AMS routes in BFS, ORK and DUB.
I'd also like to point out EI would achieve very little from "forcing" Cork passengers to Dublin, as it's very possible many will choose to fly with a competing airline.