I never get how a healthcare system could "collapse". What could happen, and in fact what is happening in societies with stretched health care systems, is that people get triaged and wait, possibly until they die off.
I can think of 3 colleagues (out of my team with capacity for ~9) that have left emergency medicine altogether, and 5 more that are trying to cut back to part time, in large part because the day-to-day has changed so dramatically over the last 3 years.
Part of the collapse is when the boots on the ground decide "nope, this isn't what I signed up for" and find something else to do.
It's caused when a surge in traffic causes a self-reinforcing blockage that doesn't solve itself even after reducing incoming traffic below the pre-surge level.
Network traffic planning is always a conflict between efficiency and edge case tolerance.