That is similar to the concept of Numenara - which is set in the future 4 billion years from now. At that point in time, the earth no longer geographically resembles anything current and has been repopulated a couple of times by disparate races of non-human sentiences. The current population (as of the the beginning of Numenara) are yet another group of humans transplanted or created in-situ and living in a world where the technologies of the past resemble magic. It seemed pretty clear that, from the background, there clearly is not a thing that is magic, but its stand-in is unknown and sometimes, unknowable, creations from a lost past.