Well, next time you're a major publisher, you jut put that little thing together, why don't you.What would have interested me would be a series of books collecting all the stories Ellison acquired, with notes on historical context, and including Priest's Last Deadloss Visions, followed by an all-new anthology that would reflect diverse new writers. Folks like, I dunno, Ted Chiang, P. Djeli Clark, Sofia Samatar, Karin Tidbeck, Martha Wells, Silvia Moreno-Garcia, or whoever.It wouldn't have the impact one book might have, it wouldn't have been a huge seller and a media phenomenon, but it would have tracked the work Ellison did and the changes in SF over the decades.
What JMS is doing is neither fish nor fowl. It's not Ellison's Last Dangerous Visions. It's not a new, cutting edge anthology. I don't know if the world really is waiting for this particular version of the book.
JMS had a huge challenge to try to ensure that the remaining stories Harlan had bought (many had been returned to the authors) and some modern authors and even a previously unknown/unpublished writer would honor the books that came before while being meaningful to modern readers. Only in that way can the publication of TLDV fulfil the mission of helping to establish Ellison Wonderland (The Lost Aztec Temple of Mars) as a library and museum.