Thing is, none of this becomes definitively cool for at least another 100 million years after we go extinct, when the universe resumes an era of prehistory prio

Thing is, none of this becomes definitively cool for at least another 100 million years after we go extinct, when the universe resumes an era of prehistory prior to the next intelligent life form to emerging from some primordial soup. Worse still, if that inter-historic era never occurs due to the persistent presence of intelligent machines. At that point, all bets are off, as to whether even remnants of our pollution might remain, in the face of pervasive systems engineered to keep ecosystems free of the detritus of human civilization, and automatically recuse themselves from pristine areas that require no further stewardship.