Hillary Clinton could not win, even with a majority of the votes cast. Is the US simply never going to elect a woman as President?
Well, as you say, she got the majority of votes - so what makes you think they can't win?
Clinton didn't get the majority of swing voters in the 5-6 states where the election is decided, that's why she lost. I see no reason why a woman can't take 75% of those votes. Whether that woman is Harris, is another thing.