The New Shadow is intriguing as a fragment but I don't really want to see someone who is not Tolkien try to extend it; at least not as a licensed adaptation that a lot of people would interpret it as "official" in some way. But I don't think an adaptation that broke off at the same place as the text, before there's any payoff to any of the ideas that are introduced, would be very satisfying. I can see how others disagree, though.