The best people are the people who change

I was thinking about how every significant character is put through some sort of test, and there are those who fail and those who pass.  Lydia remains as stupid as ever after the terrible decisions she makes, Mr. Bennet doesn't become a better father, Mrs. Bennet is still ridiculous, Lady Catherine and the Bingley sisters are still snobby, Mr. Collins becomes even more self-righteous, Charlotte Lucas is unhappy but stands by her decision to marry Collins, Wickham's character is still wicked, etc.  Those who pass, Elizabeth, Darcy, Georgiana, Bingley, and Jane, are the best characters and the best people because they take it upon themselves to improve and come out of their trials a better person.  They are forced to see how they really are, and if they do not like what they see they must change it for the better.  I think Austen is making a comment in this book that the best people are the ones who are interesting, have the potential to change for the better, and actually do so, and the better the person the greater the change. I was also thinking about the only characters who are exceptionally good from the beginning of the text: the Gardiners. They are both of good sense and character, classy, hardworking, entertaining, and a moral, intellectual, and social bedrock for Elizabeth. Are they Austen's idea of an ideal couple and ideal people? Are Elizabeth and Darcy ideals by the end of the text?