Not everyone wants him to keep his job. For example, the Tlaiban want a Fed Chair to focus on "eliminating climate risk and advancing racial and economic justice." That would teach everyone who wants to curb inflation. https://www.yahoo.com/entertainment/aoc-tlaib-pressley-urge-biden-235933293.html
It almost happened on 9/18/2008 after the Lehman collapse. https://seekingalpha.com/article/119619-how-the-world-almost-came-to-an-end-on-september-18-2008
News of American soldiers getting back to the US came as a shock for most of us. The soldiers were not less than any hope for Afghans who are against the Taliban. As far as it is about the financial crisis happening in the US because of the financial crunch in Afghanistan, I don’t think anything like that would happen.
the real answer is it depends on the time frame ... on a long enough time line anything is possible ... In 1985 the now deceased Clergyman David Wilkerson (living in New York City) released a book named "Set The Trumpet To Thy Mouth", wherein he foretold a plague coming upon America at which time all the bars and restaurants would shut down. I remember back then thinking to myself, I don't think i would have said that. It wasn't impossible for me to visualize, but it seemed highly unlikely in my lifetime. You always think such events are for some time way off in the distant future and most times that is a comforting thought if you think there is any credibility to the prophecy at all. Wilkerson didn't pull any punches and the most alarming of his predictions was on page 1 where he says America will be destroyed within the space of 1 hour, burned up with fire from bombs and few will survive. Not long ago, i thought of that book and sure enough i still had a copy and pulled it out. I only read the first page and quickly put it away again. I'd certainly like to think his predictions are not all accurate. I hope that's the case. Or maybe as in the Biblical account of the city of Nineveh, historians say Jona told of the destruction of Nineveh and forewarned them, after which Nineveh repented and it was another 200 years before they returned to evil ways and were eventually destroyed. So it's entirely possible, that in the scenario where America would be destroyed, it might be at a later time. I'm not moving to New Zealand, but I'm not one of those who thinks a thing (positive or negative) could never happen here to me in my lifetime.
The stock market crash in 1929 certainly is worse than the Taliban took over. Lehman collapsing in 2008 came close. In the future, there are a number of possibilities A nuclear war? A pandemics worse than covid19? A big wild fire that destroys California? A big storm that destroys New York city?