One potential failure mode to watch out for is ending up with readers who think they now understand the arguments around Strong AI and don't take it seriously, because both its possibility and its impossibility were presented as equally probable.
I had this thought recently when reading Robert Sawyer's "Calculating God." The premise was something along the lines of "what sort of evidence would one need, and what would have to change about the universe, to accept the Intelligent Design hypothesis?" His answer was "quite a bit", but it occurred to me that a layperson not already familiar with the arguments involved might come away from it with the idea that ID was not improbable.
If Strong AI turns out to not be possible, what are our best expectations today as to why?
I'm thinking of trying myself at writing a sci-fi story, do you think exploring this idea has positive utility? I'm not sure myself: it looks like the idea that intelligence explosion is a possibility could use more public exposure, as it is.
I wanted to include a popular meme image macro here, but decided against it. I can't help it: every time I think "what if", I think of this guy.