Joe Biden has a cabinet, and they can decide that Joe needs to go because he is brain-dead. They invoke the 25th Amendment of the Constitution and remove him from office. That gets rid of Joe, but it also makes Kamala Harris the President. Then she would be running as an incumbent. Whichever way they look... Democrats are stuck with their choices.
Like I have always said... Democrats just never think things through.
I would disagree to some extent-
I believe Harris was chosen for the very reason that she is so incompetent that the republicans would not invoke the 25th- she is Bidens defense plan,
I do believe its his cabinet / wife making all the decision for him,
as for Bidens performance friday with Stephanopoulos-
This did not help him at all, if anything it confirmed that even in a friendly controlled environment where has rehearsed the answers Biden is not capable of a coherent thought,
I still believe they will put up Newsom, He has the most face and name recognition around the country, Democrats are to the core are racists, in fact the worst kind of racists, They will not willingly give Harris the reigns,
i also think you are correct that Trump will select a person who is more of an extension to himself and not a person who would disagree with him, however- in 4 years, i do think without Trump at the helm this would be political suicide for that person,
Biden will annouce his departure from the race sooner than later- the interview had all the trappings of a " last gasp"
as for the Republican Project 2025-
I do think there are some good things in there but it goes a great deal too far in my mind
https://www.bbc.com/news/articles/c977njnvq2do