"Lights out manufacturing" has been a thing around the world for literally decades. This is not new. The main "problem" is feeding the machines enough raw material and removing finished parts so they can keep running without human intervention. Not surprisingly, there are now robots for that.

https://www.machinemetrics.com/blog/lights-out-manufacturing

As far as why your scenario wouldn't happen: why would it? You can dream up anything you like, doesn't mean it makes sense.