I would think that apart from maybe high summer, that an ATR is far better suited for the loads on this route than a 737. One thing for sure, its overkill if both WW and EI operate, especially as FR are daily from EMA aswell.....
80 flights a week by EI, that's some increase in schedule - off the top of my head, there are 3 daily DUB, 2 daily ORK and 1 daily SNN in summer 2012 -which makes 42 flights a week outbound from BHX. Maybe they mean 80 return flights a week? If so there is no room for NOC on that calculation, or perhaps they are planning a 4 times daily service there
I can't think of any other Irish destinations apart from Galway, Kerry and Sligo, none of which I think would be hugely viable as year round ops (perhaps Kerry at a push?)