Prince Knud had two sons - Ingolf and Christian - and neither of them had male children. If the 1953 law had never been implemented to allow women to succeed, who would be King of Denmark in this future after "King Ingolf" passes?
I think that Dag can give a correct answer, but I know that several dynasts lost their successional rights because of the law of 1953. I don't know if Prince Carl (Haakon VII) renounced his successional rights when he was elected King of Norway. If not, I guess that King Harald would have been King of Denmark now. But if the Norwegians didn't have successional rights, the heirs to the throne should be found in the Greek Royal House. That would have made Constantine King of Denmark If a Greek-Orthodox Royal could be allowed to accede to the throne.
King Haakon VII renounced the succession rights to the Danish throne for himself and his son in the Norwegian Council of State 27 November 1905.
A copy of the document was, as I understand it, included in the Danish Protocol and thereby became part of Danish law.
DTH
RW1