As of now things seem to be back to normal. Scary that this can happen. I know that from time to time the CAD system goes down but not the entire P25 system.
Site trunking is hardly a complete crash for a system that is nearly all single-simulcast-site. The North site would get a bit... interesting... , but for the remainder, little is lost save some situational awareness and convenience for the console operators.
It happens. It can be ugly when it happens, but it happens, both in core failures and in planned maintenance events. Half of the time it happens around here, a casual air-side listener might not even notice because the disruption to operations is fairly small.
That said, you add a complete unplanned loss of everything for the Center including CAD.... that's a much bigger wrench. Sounds like they handled it smoothly and safely though, and got the world spinning again