What if Strong AI is just not possible?

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.