Im not too sure the DAA are that expert at anything, to be honest. Look at the mess they made of Great Souther Hotels, at a time when every hotel group in the world, across the whole market spectrum were investing in Ireland GSH was a chronic money looser. Look at the niche Bewley's have built for themselves in the UK and Ireland, as but one example.
I still believe that Aer Rianta International should be turned into the holding company and the airports turned to the DAA, CAA and SAA to run. That way the airports will still be independent of one another but not have to be broken up. It's the only way forward I can see.
Brian.