The question is if Charles actually wants to announce that she'll be known as HRH The Princess Consort. I personally can't see him as doing that - it would be a personal defeat if he is not able to accord his legal wife her legal title. Of course when this "it is intended..." was published, they did it for the sake of the marriage and the right of Camilla to be known as HRH but I seriously doubt it was Charles' idea and that he whole-heartedly supported it. It was a means to an end and nothing more.
It is no secret that what Charles and the people of his office at St. James' and what the queen and her people of her office at BP think is most of the time not the same. Once Charles' is king, only his opinion counts and the guys at BP are out of business. I doubt that it is in the interest of the government to insist on a change in tradition, Charles won't want that either, so it will just be the media and we have no idea how the media will react in the direct aftermath of HM's death.
I'm not sure it's only Charles's choice. While this isn't a popularity contest and results of polls aren't necessarily all that relevant, the royal family has hopefully learned a few lessons about the dangers of trying to do major things that are really unpopular. If the government and the senior royal advisors really believe that forcing the issue of Camilla being known as HM the Queen Consort (and being crowned and whatever) will do serious damage to the institution of the monarchy, Charles might not have much choice. This is the obstacle that Edward VIII ran into - he was concerned about what he wanted when he was King, whereas the government and the civil servants were more concerned with preserving the institution of monarchy and the position of King in general; the identity of the person in the position was a lot less important to them than the stability of the institution itself.