The Far Future in science fiction

Here's an unpublished essay on the far future, which was written as a chapter for an academic text on modern SF. The chapter was written at short notice after the original author (identity not known to me) was unable to deliver their contribution.
I was asked to concentrate my discussion on more recent works of SF, with an emphasis on post-2000 material. I was also invited to discuss my own works in this context, which I did. In their comments, the editors asked that I spend less time...