Biden is still within cheat range. If that changes or if he gets worse you are right he’s gone
Furthermore, I do believe that if somehow Trump manages to win the election, the Democrats will pull out every stop they can to keep him from being inaugurated.
True to their nature, they'll do everything they accused Trump of doing in January '21.
There will be court cases in every state Trump wins. There will be riots in Washington DC. There will be efforts to sway electors. Kamala Harris will get involved.
Of course, it'll all be about "Saving Democracy."