He could leave on a high, knowing that he has delivered on his promises for progress and restored decency to the White House. He did serve as a balm to the bombastic Donald Trump. Over the next two years he could get more of what he wants and then step aside. It would be self-effacing and patriotic, a stark contrast to the self-absorbed and treasonous Trump.

He offered himself up as an escape from Trump and Trumpism, a way to help us get our bearings after the thuggish and hallucinatory reign of a con man. Then he and his team got carried away and began unrealistically casting him as an F.D.R. with a grand vision to remake the social contract. Biden’s mission was not to be a visionary but to be a calming force for a country desperately in need of calming, and a bridge to the next generation. So he’s a logical one-termer, and that keeps him true to his high-minded point: What does the country really need?

The country really needs to dodge a comeback by Trump or the rise of the odious Ron DeSantis. There is a growing sense in the Democratic Party and in America that this will require new blood. If the president made his plans clear now, it would give Democrats a chance to sort through their meh field and leave time for a fresh, inspiring candidate to emerge.