Doing that would admit weakness and fallibility.
Leftists must double down on being infallible, that they cannot admit that Joe was a mistake the first time round, as well as fighting the notion he is mortal as his aging has hindered his ability in any way.
My guess is when he dies they will start embalming Left wing Presidents like they did Lennon so that people can go visist him for the rest of eternity, a type of left wing god-like immortality because we all know we would all shrival up and die without them.