Good.
potentially undermining trust in incumbent governments for the foreseeable future
Even better. Trusting government is a fool's errand.
But, the document says, this should not be seen as defeatism, but rather a “wakeup call”. If nothing is done to adapt to this “post-primacy” environment, the complexity and speed of world events will “increasingly defy [DoD’s] current strategy, planning, and risk assessment conventions and biases.”
IOW, it's not the Department of Defense at all. It's more like the Department of World Domination.