I'm not sympathetic at all. The stated "if these things are in the public domain we can't make money" is hardly a compelling argument.
We've travelled way outside copyright protection to claim that nobody can use a character invented in a book that is now in the public domain. Contrary to their assertions, all the character development really needed for much of the derivative stuff was laid down in A Study In Scarlet.
The argument is definitely about money but it is also about the characters that have appeared in a
series of books that span many years, with ten books are not yet in the public domain. They remain copyright-protected.
I can see where a legitimate argument is made for protecting the characters. It can be said that the characters were being developed from first book to last, and the last have the fully developed characters that are still rights-protected.
At any rate, whenever the copyright actions by Doyle's estate are exhausted, and when it is finally decided when it will be that the characters must join the pre-1923 Sherlock books already in the public domain, there are probably not too many people who will want to use Sherlock or Watson as characters, over the risk of infringing on the
trademark rights in the characters that are held by the estate.
But I guess I can be happy with whatever is finally decided.