There's lots of crashes, but they're over-predicted. A quote I can't remember perfectly, "we predicted 10 of the last 3 stock market crashes".
That said, if the levers of power in the USA stop being independent, if they all become bound to the will of the President, there's a strong risk of someone — could be the President who ends their independence, could be a successor — crashing it all very hard. If whoever is in charge at the time hates intellectuals, I mean it can be Pol Pot hard; but even if the leader at that point tries to do it all right and listens to sane advisors, it can still crash as hard as the Chinese famine resulting from the Four Pests campaign.
The USA isn't there yet. That's the direction of motion, but even with the current speed of change, there's enough independence that it's not even close to that bad yet.