I've read Black House several times and I didn't get that feeling beyond what I get it from every book that SK writes. I mean, I'm not saying that he out and out starts asking questions about God (or goddess, or coyote, so on and so forth) in all his books, but most often I see him questioning the nature of good and evil within the framework of the story and his characters.
Now as to the possibility that we are talking about Jack Sawyer's "fate"
I dunno. I thought Jack Sawyer was compelling as was the world that SK and PS created. And of course, I loved the way it intersected with The Dark Tower (because I am a giant dark tower nut. I can nerd off for days to those books and the concordance)
While there aren't really sequels to SK's stuff, I think it is valid to say that it all falls under an umbrella. We find out what happens to certain characters from certain books in other books. There is a continuity. It's a small world and all that.
And since I enjoyed reading it so much, maybe they did it because it was fun to write it and to be writing it together.
Or they just magically knew that if they didn't write a sequel I would have been in torment all my days!
Ai, No! **telenovella style hand sweep across my brow**

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