Highly unlikely. You would have to wipe out over 99% of human population.
Possible, but highly unlikely.
I don’t think it needs to be that high. The average person is not competent on modern technology. Any mass casualties, in my opinion 75% or above, could cause our technology base to drop 100 years. It would also be important if a single area was no affected. Energy production, food production, medical production, most manufacturing is only capable through the efforts of many people understanding a portion of the complex system.
I read how penicillin was first produced. I couldn’t do it on my own or with 10 random people.
That;s exactly what many are coming to believe happened in 10,600 BC.
The Earth passed through a huge (100 mile dia) broken up comet field - the resulting strike burned of 4% of the worlds vegetation, killed off the mega fauna, destroyed existing world wide civilization, ushered in the Younger Dryas Cold Event which lasted 1000 years.
In the process, the surviving human population was driven insane, lost their memory of the past, and had to start over again without knowing who they are or what came before.
You don’;t have to wipe out 99%.
We all can describe how phones work, but who here could build one from scratch? Mean while, while you write down all the steps you can remember, some one has to feed you, or you have to fed your self, but other people have dibs on the food so you get none, starve to death ; no one has a clue what was on the paper where you wrote everything down, but it makes a good fire started which is more important that phones.
You just have to make life about personal survival, minute to minute - all the rest is unimportant and is quickly forgotten.