To date I've listened to all the Coast to Coast radio interviews and as many other interviews with David Paulides as possible. I wanted to see the doc so badly after hearing him answer questions, appear on Youtube, but I was somewhat disappointed.
This book series lends itself more to a whole Missing 411 series on Netflix or Hulu rather than a single doc. There are so many interesting cases, and David has a knack of walking you through the facts without inserting interpretation.
One of the lasting outcomes of his work will be a national database and the accountability of the National Park Service, an organization I fully admire. This doc does not reveal the level of obfuscation that they have put forth, leading to wild speculation.
The mystery of missing people alone is worth watching this but it doesn't do the book series justice. Perhaps no single doc could. So, maybe we'll see a series in the future.