Ish's post is very well reasoned and a timely reminder that the King's choices were not those of the "monarchists" but his own, firstly in naming his daughter as successor of the Royal house and secondly in asking that she be considered as the next monarch were the monarchy ever restored.
The monarchist choice, based on the provisions of the 1923 constitution, was the Hohenzollerns. Since the King's decision, they have done what they can to undermine the King's proposal, primarily through attacking his son in law but also by exploiting other issues. The Hohenzollerns have not contested, overtly or tacitly, the King's proposal, as shown by their total disengagement from Romania.
In the meantime, Margareta has devoted a quarter of a century of her life to her country and Nicholas was clearly prepared to follow in his aunt's footsteps, doing much good work in the years before 2015.
Nicholas' arrival on the scene gave the "monarchists" a different angle of attack: promote the King's grandson as an alternative, bypassing the King's named successor. In the absence of the Hohenzollerns, he is male and a blood descendant of the last King, so his gender, his origins and his clean image (as was) could be used as weapons against his female aunt, and his Romanian uncle, tarnished by his past. In other words, they set up the young man against his grandfather's wishes and carefully laid plans, and undermined his aunt's work.
The King clearly understood that for there to be any chance of a return to monarchy, his family needed to be beyond reproach and exhibit exemplary standards and behaviour. This tallies precisely with his own moral outlook on life in general. Seen in this light, the removal of his daughter, following her criminal conviction concerning cockfighting and illegal gambling, and his grandson, following his alleged fathering of a child and subsequent failure to resolve the arising paternity issues, are entirely coherent.
Irina admitted her guilt and accepted the judgement of the law. She made no comments on the King's decision and there has been no lingering media fixation over her removal from the succession because, as third daughter, she is not in the direct line of succession and of all the Princesses, she had probably had the least to do with Romania since the family were allowed to return.
Nicholas' removal, however, is a different kettle of fish as, without him, the "monarchists" are stuck: there is no realistic alternative to promote. With growing evidence that the King's days were numbered, and the chances of a legal recognition of the Royal house in the form that the King had proposed, they needed somehow to disrupt as much as possible the succession which the King had chosen but that they did not want. However, with no legitimacy either from the 1923 constitution or from the King's house rules, Nicholas has lost his effectiveness as their weapon against Margareta.
But he's still the only weapon they have.
Now, with the King gone, they have taken their gloves off, even to the point of interrupting the mourning period with an "open letter" imploring Margareta to rehabilitate Nicholas. They are desperate to have him reinstated so that once again they can use him to their own ends.
Nicholas doesn't need anyone, especially Rotariu, to write open letters to his aunt. He needs to sort out his own affairs with the paternity case and thus prove to his family that he wishes to make amends. He also needs to cut off the oxygen supply to these vipers by avoiding making public statements to the media, and through lawyers, and publicly distance himself from their machinations by proclaiming his recognition of and loyalty to the fundamental rules as they stand. He needs to make the vipers understand that he won't be a pawn in their kingmaking games.
With the paternity issue resolved and Nicholas free from the clutches of the vipers, there is a chance for the family to reconcile, initially on a human level and then down the line, for Nicholas' reinclusion in the succession. The "monarchists" need to back off and accept that their only hope for a monarchy in Romania is if the family is united and if they are united behind a united family.