It is very hard to dislodge a President against his will and old Joe just won't go.
And why should he?
More importantly, who would want him to go?
In a weird way, Joe Biden is the Donald Trump of the Democrat Party - he is delivering for the Hard Left Democrat activist base everything on their agenda that they have worked so hard for and that the Dem pols have promised them for 60 years and never delivered on.
Biden is the Hard Left's dream come true and the activists that control the grass roots of the party are loving the guy. - except for that Israel thing.
History can help us here.
The last incumbent President who dropped out during primary season was LBJ—and that was due to horrid polling numbers in upcoming primary states.
There is no serious opposition to Biden in the Democratic primaries.
Therefore the Democrats are on auto-pilot.
They can scream and wave their arms all they wish—as the Economist article says correctly:
“There is no Plan B.”
If Joe is still around, he will be the Rat nominee. Thus ensuring Obama’s fourth term.
If his body checks out like his brain has, the Rats will replace him with the Mooch.
Thus ensuring Obama’s fourth term.