The #NYTimes called for Biden to step down.
If #Biden did step down, I think that would guarantee a Trump presidency, so I think it's about the same as calling for a Trump presidency.
And if it did happen, it's too late for a primary, so Democratic Party elites would just pick someone without any input from voters. It would be like (or worse than) 2016 when they backed Hillary Clinton and convinced other people not to run against her, so we got an unpopular nominee that voters didn't want.