DUB does not and won't be getting a second runway for a very long time even if numbers go back over the limit before charges can be charged for the new runway
I would have to disagree with you.
Ego is a great and terrible thing so there will be a new RWY when that target is achieved.
No airport the size of DUB needs a second runway. LGW is the example and DUB will have a slick operation like them over the next few years with the same level of movements at certain times
Need is part of the equation.
SESAR has looked at increased RWY occupancy using time based operations.
This will apply more at major capacity constrained airports in Europe.