B788 is small enough to make it work I would think. Anything else is too large IMO.
I wonder how much market is left on the island for the ME carriers? The unmentionable have cut their DUB service down to 1 daily for the first half of next year, and have stopped sending the 777 up too. With the economies up here picking up the young people are coming back from Oz, and those that aren't have settled down enough where they don't come home twice a year anymore.
Still competition is good, regardless of which airport they rock up to prices will drop as a result.