Question

At the end of Billy Collins' poem Death of Allegory, what happens to the allegorical characters?

Answer 1

They're fast asleep :/
I think

Answer 2

"it looks as though they have traveled down

that road you see on the final page of storybooks,

the one that winds up a green hillside and disappears

into an unseen valley where everyone must be fast asleep."

In this final stanza, we're drawn to a sad conclusion. The great ideas and virtues seem to have all disappeared into oblivion. An unseen world where everyone is, apparently, asleep.