200 AD is only 120 years after the Flavian Amphitheatre (Roman Coliseum) was completed. The Coliseum encompassed engineering marvels not to reemerge for nearly two millennium. Given that, does their invention of the pocket multi-tool still surprise you. What intrigues me is how did we manage to waste 1500 years by going backwards. And, could it happen again? I believe it could.
And how could an American president produce a budget eliminating our ability to move astronauts between the earth's surface and the space station. He wants to rely on Russia and China for those services.
Now tell me going backwards does not have a high likelihood.