There is no need to worry about it for a while because for 8 years after President Obama we will have the first woman followed by 8 years of the first Latino/Mexican then either the first gay President or the first Asian.
Plus, President Obama is only half black so the election of a fully Black person is still on the Democratic bucket list and that just may be Michelle Obama.
Clinton didn’t come from the Washington insiders list, he was a breakthrough candidate himself.
Democrats don’t need advice or prognostications from the motor mouth Trump that can’t see his own destiny that is crystal clear to us.