For starters, I will cry tears of joy, because it means my daughter will grow up not remembering a world where there had never been a female POTUS.
Second, people will start saying, Hey we have a woman in the White House, so sexism is over! Good job America! Except not. I can't see the future, but I'm guessing that violence against women, gender bias in academia, low rates of women in tech and management, street harassment, and belittling of women's achievements won't magically end when Hillary takes the oath.
Although, racism did totally end when Obama became president, so I could be wrong.