The challenge - alluded to in the article - is that having a functional military requires a domestic manufacturing base and machine tool industry. The U.S. generally tries to keep its arms manufacturing in-house, for obvious national security reasons. But even if you've kept the existing defense contractors alive, you lose out on the ability to repurpose the country's civilian manufacturing base if it doesn't exist. This was pretty critical in WW2: General Motors made more TBM Avengers than Grumman, Chrysler made more tanks than all German manufacturers combined, Kaiser made Liberty Ships by the hundreds. Without the ability to quickly tool up, you'll end up defeated in any war of attrition.
There's a pretty significant risk that we'll find out that the U.S. is a paper tiger if it comes to any sort of prolonged war with a near-peer power.