That we have a candidate morally unfit for office doesn’t take away from the argument that Joe Biden is having cognitive issues that render him an inappropriate candidate - if he looks this incapable now, where will he be in another four years. Certainly a freaking rock would be a better choice than Trump. But I do believe we need an open conversation around a new candidate on the Democratic side.
You say you literally can not replace #Biden, and then you talk about how the replacement can be done :)
OF COURSE you can replace Biden at this point.
Trump is so unpopular that there's a good chance the best way to beat him is to nominate nearly anyone better than Biden.
There's on sense fretting about Trump making court challenges. They'd be laughed out just as easily as his election challenges were laughed out.