Does anyone doubt that Biden would then either be forced to resign by Democratic politicos (for reasons in addition to his escalating dementia), or would be impeached and perhaps abdicate Nixon-style?
The presence of the now predictable mediocrity of Kamala Harris and the impossibility, given her race and gender, of removing her, for now is about all that keeps a cognitively declining Biden still in office. The Left fears what she could do as president to the Democratic Party; conservatives are terrified of what she could do to the country.