Chrissy, I have thought about the title issue a lot as well, and now I am coming to believe sincerely that Camilla has made the right choice, she was totally wise, I think, to go by Cornwall instead of Wales. This is what made me come to this decision: I feel that by going by Cornwall, she is disassociating from the "Diana" thing, and far from wanting to be anti-Diana, -- in fact I think Camilla is very evolved in her capacity for forgiveness and understanding -- I think that by going by Duchess rather than Princess, she is saying, "Hey, I am a different person. Diana was Diana. Camilla is Camilla. "I am me and I want to be who I am, and I don't want people saying, oh look there is the 'second Princess of Wales', compare her to the first (of their/our lifetime)." So I agree with you!
There is Diana, Princess of Wales, and now we have HRH Camilla, the Duchess of Cornwall. Amazing isn't it? That Prince Charles loved two women in his life, but two women who could not be more different?! And yet there are similarities, I suppose, but how great are the differences!