I suspect we'll head back to the 14th century and stay there pretty much forever.

I was quoting John Connor from Terminator 2, but you're right. We're getting there one way or another.

People will spend two hundred years picking over the bones of cities that are too big to live in. Glass bottles, scrap steel and iron and wonders they can't create.

Your comment and description also reminded me of Tyler Durden's "Abandoned Superhighway" speech from Fight Club.

"In the world I see - you are stalking elk through the damp canyon forests around the ruins of Rockefeller Center. You'll wear leather clothes that will last you the rest of your life. You'll climb the wrist-thick kudzu vines that wrap the Sears Tower. And when you look down, you'll see tiny figures pounding corn, laying strips of venison on the empty car pool lane of some abandoned superhighway."

Yours might be better, actually.