The full title is "The Flat Earth Made Round and Tolkien’s Failure to Finish The Silmarillion".
This is a piece I've been working on for quite a while. I delivered part of it at last year's Kalamazoo (2019) but expanded it a good deal for this final version.
It looks at various elements and events that combined to hinder Tolkien from finishing THE SILMARILLION in the years 1951-1973. In particular I single out two key factors:
(1) the traumatic breakdown of his efforts to publish the book through Collins, leading to a catastrophic interruption of his work on the book
(2) Tolkien's conclusion that many of the most iconic elements in his mythology could no longer evoke secondary belief in modern-day readers.This most intractable of problems facing him led him into an impasse wherein he decided he must make a major change without being able to bring himself to do so".
That at any rate is the gist of the piece, which is available in its entirety on the JOURNAL OF TOLKIEN RESEARCH site. Enjoy!