[jrowen]

For certain definitions of "conceivable" that all involve massive amounts of handwaving to get from big disaster to literally every human that speaks language died somehow and the handful left just can't put any of the pieces together from the bazillions of artifacts left over.

Sorry, I don't think there's any point in spending any time designing anything for that scenario (except as art or philosophy, but nothing practical). I feel like people are underestimating how resilient and embedded and redundant our society is at this point, and how very specific the scenario would have to be to lose everything yet humanity survives.