Dublin needs a longer runway? Cork needs a longer runway too, then! Lagos once or twice a week in the summer a banker and I am not taking the P!55! Istanbul twice a week if not Dubai or Abu Dhabi to connect to the Far East.
The short runway issues all come back to the smoking gun - Shannon and the political patronage it enjoyed for decades from various political administrations. What wreckage that has caused - we are still seeing it today and everyday. As for Dublin's new terminal? More prison space is needed and T2 would come in handy!