But I am curious how say CLB would react if future guy was defined differently by a subsequent writer or his version and reimagining of future history was ignored and contradicted by someone else? .
I can't speak for Christopher, but IDW recently did a Khan comic book series that pretty much ignores my novels about Khan--which is fine with me. It's not like I created Khan or think that my books should be the only version of his life.
Let a thousand flowers bloom.