I am also among those who would wish to see Nikolaos as head of the house. His greek is better, his wife more liikeable, and he looks more royal than a simple jet-setter..
MC is a waste of time
I can say that before his father's passing and his funeral i had an idea of Pavlos as an Instagram / Disney / Hollywood prince.
But my opinion radically changed as he behaviored in excellent way as a real Head of family and of the Greek Royal House. If royalty existed in Greece he would be a good and capable King. But royalty is abolished.
So in the actual situation what can he offer? Impeccable behavior Yes, and then? Did he ever show that he tries to offer something in the country ? No. He might have secret important actions, but nothing is known by the people. He is immensely rich, but nothing goes to the Greek people. I'm not talking about money only, but also about help actions, charity foundations or other things. Nothing. Out of their participation in royal events ...white tie and tiara.. he is completely absent from any action which could associate him to our country.
Also Marie-Chantal: despite her dignity, what could she offer? She is CPrincess now for more than 25 years, what was her presence or added value to her supposed 2nd homeland? Nothing. Only a shop with kids clothes.
Also I found very strange her behavior at the Metropolis when she arrived escorting Queen Anne-Marie. Instead if staying and receiving her husband's official greeting (at this moment he was the Head of the royal House greeting his highest guest: the widowed Queen.
And MC did not stay and ran inside, obliging him to turn and look for her. I don't know the reason, but it was not appropriate.
The next member: Konstantinos-Alexios. No idea, but if he has been more influenced by his mother side...zero.
On the other side Nicolaos. Warm, human, active in actions related to the country, with personal involvement, completely part of the Greek environment. With an extremely approachable and active wife, which does not lose any occasion to praise Greece and declare her love for.
So for me no doubt : Nicolaos.
But... no fuss: Dynastic rules are strict especially for succession matters and.....Royalty is abolished In Greece.