I don't buy these predictions, but WWII isn't a good argument. War also unites societies sometimes. So maybe WW3 will save us from the next collapse.
When the height of lockdown and the gas shortage in the US showed more people hoarding and scalping goods than trying to self-regulate and ration, I couldn't help but wonder what it would be like if people had to wartime ration in today's culture. There is a narcissistic streak in the Baby Boomers (they were called the Me Generation previously).