The Slow Motion Apocalypse

"We’re on the brink of a slow-motion apocalypse.  A generation or two from now, humans may live in a world where they still have access to amazing old machines left over from a smarter civilization, but lack the brains to make new ones or even service the old ones. A generation or two later, after all the old miracle machines have worn out, feral humans may wander the burnt-out ruins of the civilization we left them, like barbarians gawking at the wonders of Rome."