Lets look at MAG forecasts. At the time of the second runway application they projected that by 2005 the airport would be handling 30 million passengers... They actually achieved 22.4 million which was the record year. As recently as 2007 when numbers were 22.1million in the revised revised plan they said by 2015 they would be handling 39 million...... Forecast for 2013 is 20 million so next year they have to nearly double their numbers to be on target!!!!
In any organisation errors of that magnitude even after adjustments for certain events would result in senior people departing.