Prague and/or Budapest could be potential Wizz destinations and Bratislava could also for Ryanair given the large Slovak population here. There's no doubt that the Motorway to Dublin is also having a big impact even though if people took the increase in the cost of petrol into account, the cost of tolls and parking fees at Dublin into account they might think again. I recently met some one who paid just €125 to fly Dublin Zurich return. However the overnight was €75. Say petrol cost €60 and tolls €12, total cost € 262.
I reckon he could have flown on a full service codeshare via LHR or AMS for a miserable €38 extra and save himself a lot of driving. However most people don't look beyond the headline fare.