My thought on what is about to happen...
A president might issue an executive order to resolve stalled issues. Presidents can use executive orders to direct executive action without congressional approval - when legislation is blocked or delayed. Joe will EO the budget long version! Trump would have to fight it at the Supreme Court.
I know WWIII may also be a reason. That would give reason for extending Biden's presidency.
Or, the bird flu in CA will shut down the entire USA. The military to round up everyone for MANDATORY jabs.
Imagine if Joe Biden decides to step down on Jan. 1st, and Kamala becomes President.
Kamala is sworn in and immediately declares war on Russia. Military refuses... as Kamala is NOT a natural born U.S. citizen (neither of her parents were U.S. citizens until years after she was born) and by law she isn't qualified to be president.
Now we have a national crisis... an illegitimate President who is not the Commander in Chief. Any executive order she gives is accepted by some, discarded by others and not legally binding. That would add spice to our holidays.
Relax, if Biden and Harris can't do the job they would tap Speaker Johnson to be POTUS so we would still have a Democrat for President. See? All is well. /s