And they're doing an outstanding job of it!

If the 25th amendment is used, the President has 30 days to inform in writing that it is being challenged. Then Congress is then required to hold hearings and resolve the issue with a vote.

Good luck with all of that.

In this case November is the better option.

If anything, he will stay in office at least through the convention. It’s too complicated and ugly to choose another nominee at the convention.After the convention, the top party officials can pretty much replace Joe with whoever they chose. I think he will resign after the election if he steps aside or loses. Then Harris will pardon the Biden clan for everything.
In the meantime Hunter is sitting in on meetings in the White House so he can claim executive privilege on all his foreign business dealings.