It doesn't matter. The MSM and the dems will prop him up until the last damn day of his term. If ANYONE "takes over" for him mid term, they would inherit his failures and thus be kryptonite in 2024. The DNC knows Joe couldn't beat a sack of potatoes if he had to run a real (read "non-basement hiding due to Covid") campaign, so they are desperately trying to find a knight in shining armor to be able to put forth in 2024. They would never tarnish that knight's armor prior to 2024 by associating him/her with Brandon at this point.