I've thought about scenarios of failed RSIs. My favorite is an idiot savant computer hacking AI that subsumes the entire Internet but has no conception of the real world. So we just power off, reformat and need to think carefully about how we make computers and how to control AI.

But I've really no concrete reason to expect this scenario to play out. I expect the nature of intelligence to throw us some more conceptual curve balls before we have an inkling of where we are headed and how to best steer the future.