In thinking about if there were signs that maybe the possibility of her stepping down at some point had maybe entered the realm of thought and/or conversations I remember feeling that something maybe had or was changing in QMII's thought process when Frederik gave his speech. That speech was really a proclamation from him to his mother that he was ready to take the helm with, as he put it, his second-in-command (Mary). He spoke of how they shared a mission but only one could steer the ship at a time. That made me think that maybe the idea had at least been in the air.
It was a fantastic and strong speech of someone that was settled in what his destiny was and that he was ready, willing and prepared to take the helm when the time came.
Video of his speech:
Unfortunately, I could not find a video with English sub-titles, but here is a video that contains an English translation in the caption section -
https://m.youtube.com/watch?time_con...e#bottom-sheet
And the article on it with the speech
https://www.billedbladet.dk/kongelig...allataflet-her
And beautiful photos
https://www.instagram.com/p/CiYVkHHj..._web_copy_link
I think hindsight is always 20/20 and if we look back there were signs. This did not just get decided on the fly. Plus, just based on how things have been announced since the NYE speech, it is obvious that many things have been discussed, planned, prepared and finalized as to how they will happen after the change of throne. That takes months to set in motion.