It seems to me that the author fails to extrapolate on the effects of recursive self improvement. The only things preventing 95% engineer obsolescence will be compute/energy constraints and the speed of adoption, which can take years for large infrastructure companies. But it's coming.
Cuts both ways. If supply chain attacks continue recursive self improvement, everyone’s going to be working in air-gapped facilities. Departments also need to be air-gapped from one another. And each team air-gapped. And so on.
There’s a speed limit, because the faster you go the less room for error you have. It’s the same as being heavily leveraged with debt. If you have a cash investment and it drops by 50% you can just wait. If you’re leveraged 100-to-1, a 1% drop forced liquidation and wipes you out.