I, for one, don't believe civilization could handle perpetual catastrophe, the loss of billions of people while retaining a grow-or-die economic model, our largest cities needing to "move" inland/uphill, and migrating populations escaping ininhabitable areas, etc. etc., without altogether collapsing.
Look how fragile it is - blocking the Strait of Hormuz alone caused economic near-calamity in some markets. It's like we are all on a fast-moving treadmill, and once tripped, there's no getting back up. This isn't the world of 1933.