When he ran last time I was convinced they'd replace him part way through the term, essentially soft launch the replacement. Can't see how much longer they can let this go on for, its at the point where you feel sorry for the guy being put in these situations all the time.
One thing that is slightly odd is that Biden gaffes and there's increasingly loud calls for him to stand down. Trump gaffes all the time, before you even get to what happened on Jan 6 or his convictions and ongoing legal problems, and that doesn't seem to be an issue.