The US, and all worldwide economies may be a bubble, sure. But they are 100% safe for as long as people keep consuming, working, and the economy keeps moving forward. It doesn't really matter for the US as much as it would matter for smaller economies like Zimbabwe or Venezuela.
We may experience a recession the likes of Lehman Brothers, sure. But nothing is going to collapse. People aren't suddenly going to go into the woods, and let their cars, smartphones, and AC units rot.
A thing that might collapse sooner than other things. People wanting generally to leave your country is more of a liability, people wanting to arrive at your country and work for cheap is more of an asset.
There is no conspiracy, no plan, it's just gonna collapse.