For what it's worth, my opinion as a BA employee resident in Ireland and using EI to commute; is that BA, in time, will reduce or even cancel their own flights to DUB and BHD in favour of EI because of the aforementioned EI lower cost base. This would also free up BA's LHR slots for future expansion.
ORK would be a dicier proposition (worryingly my commute), and could potentially see a reduction, and SNN may well finish it's LHR connection.
Talking to EI crew, the realisation is that a long term future can only be secured through consolidation and that being he case IAG may well be the best option. For a lot of EI crew, Walsh at he helm is more of a concern. Once bitten twice......