So Holland will have its first King in over 100 years and then the throne will pass again to a Queen. Britain has changed the rules regarding progeniture so if The Duke and Duchess of Cambridge have a daughter she will be 3rd in line to the throne.
These are not the only European countries who may eventually be ruled by a Queen Regnant - Sweden being the first it would seem. I think Belgium, Norway, Spain in a couple of generations will be the same.
Love it or hate it?
I think it's a good thing personally.