An interesting question and one I don't think we can know for sure.
When Nicholas was in line, I think I am I correct in thinking that Elizabeth wasn't in the succession and so one can only imagine how delicate the situation could be.
Further, what I find interesting is that the youngest daughter, Princess Maria, has a far greater visibility in Romania than all the heirs above her put together.
Princess Sophie obviously has her photographic career and attends only major events and Princess Elena has only a few engagements (if that) each year.
So inspite of the current line of succession, the family dynamic (both public and private) is not straightforward.
Elizabeth Karina was absent from her grandmother's funeral. Whether or not she was the family member who stayed with the King at that time, I don't know. It will be interesting to see whether Elena, now hereditary princess, adopts a more prominent role, although it does seem that she and Sofia, are not as involved on the ground in Romania, perhaps because they are mothers with children elsewhere - and in Elena's case, have a husband to take into account.
Clearly the arrangement between the Royal House and the Romanian state has alienated some monarchists from the idea of Margareta as heir. I am inclined to think that the unpopularity of her husband and his perceived influence is a bigger source of discontent. Nicholas is the obvious alternative focus for the malcontents, particularly now that tensions exist within the family due to his alleged misdemeanours.
However, to equate the arrangement with a dignified surrender is misguided in my view. One could argue that it is a way to maintain and protect the profile of the Royal House in the longer term, build support, and reconquer the hearts and minds of Romanians today by demonstrating over time the value of a royal family at the heart of public life. It's impossible to do that if you are in competition, let alone conflict, with the institutions of the state, with all their resources, influence and exposure. The Royal House is certainly not acquiescing to the republic; it is maintaining its dignity, its ceremony and very much behaving as constitutional monarchs do, more so than any other former ruling house, in fact.
The days when European monarchies are restored after revolutions and/or popular uprisings are gone, I think, and standing proudly aloof à la Henri V leads nowhere. The Duke of Bragança, and Leka II, Nikola II, and Alexander II in Albania, Serbia & Montenegro are all on good terms - be they formal or not - with the republican governments in their respective countries. We shall see where this approach leads in time. Juan Carlos was able to assume the throne as King not because Franco said so but because he was prepared and could carry the support of the people. Of course, if a violent collapse of state institutions were to happen, the royal families would still be there - and probably in an even stronger position than if they were unknown or still in exile.