I might ask you to tweak your model as well..."collapse of civilization" is such an extreme, dramatic, far-reaching term, people are always going to latch onto that. It's sensationalism. I would describe what you're talking about as "widespread suffering and hardship" more akin to a world war.
What do you define as “civilization”? Is it culture, norms, practices, a lifestyle, an economy, basic assumptions about the availability of goods and services and health care and medicine, basic assumptions about government, and norms and standards thereof? Is it literally every part of your life that you live every day?
It's more about the definition of collapse. By your definition civilization collapsed during World War 2.
Generally a large structure that has collapsed is hopelessly, irreparably broken - capable of performing near 0% of its function. It can't recover, it's not limping along in some form, it is "totaled" and you have to clean up the pieces and start completely over.
