The "System: very rarely changes, and then by Amendments or major court decisions and perhaps legislation of note (that is more rare). The "System" is largely what we've had for 60 years or more, and in my view, it's broken, rather badly, but the country will muddle long for quite a while longer with massive deficits and debt, which at some point is not sustainable.
The country probably will be at a precarious point someday and an "event" will happen, a pandemic, a major war, a computer hack, and it will collapse. I hope it's well into the future.