I'm not convinced that this 3rd runway would work that well.Is it going to improve the landing capacity,because it's rather close to the existing runways for independant ops.
As far as departures,I suppose that if traffic is heading north it would be of use,but it still would have to be integrated with the other runways.Has this been considered from an ATC point of view.Somehow I doubt it.
I would have thought improving Northolt,Gatwick,Stansted,Luton,City or even Manston would be better.Or take away journeys to Manchester,Paris onto to rail to ease congestion and pollution.Plus the Greenpeace patch will possibly put a spanner in the works.
Airports in the middle of the sea,or estuaries cost huge amounts of money.Both Kansai and CLK have had problems with land sinking.CLK had water all over the place in a typhoon.Just imagine a NorthSea storm.Also the road/rail system to link these places cost as much as the airport.
Anyway I will still use Amsterdam,3rd runway 6th terminal whatever.