Frederik, Haakon and Victoria are in the prime of their life. For me it is a sort of waste if they have to wait a dozen of years or more. The days that being a King was a sort of divine right are long gone.
And abdications are by no means a modernity. In her own autobiography Lonely, but not alone Queen Wilhelmina wrote that she felt very much inspired by the solemn abdication in front of the assembled States-General of the Netherlands in Brussels (1555) of Charles V of Habsburg, Holy Roman Emperor, King of Spain, Archduke of Austria, Duke of Burgundy.
Charles V concluded his Abdication Address by mentioning his voyages: ten to the Netherlands, nine to German lands, seven to Spain, seven to Italy, four to France, two to England, and two to North Africa. His last public words were, "My life has been one long journey."
This to underline that abdications are no dishonours but can be a wise and rational decisions indeed.