Let the entire system crumble, the building is rotting from the inside out, demolition time. After all, we're only talking about the U.S.'s economy, which is mostly owned and controlled by a very small % of its population. The U.S. economy is not our system of government, it's basically just a giant virtual spreadsheet of loans and debts, gains and losses. Nor is it a shared system of ethics or morals, nor the threads that bind our communities together. It's only money, and its only a symbol, a tool. Debts can be erased, new tools created, new, better systems implemented. The idea that entire swaths of civil society would degenerate into a free-for-all chaos of blood, crime, and murder is ridiculous. People find a way, Americans would find a way. Barter, sharing, communities united to ensure local prosperity and social and agricultural wealth.
Until we accept that we cannot continue as we are, that we cannot have everything all the time, that there isn't a never-ending supply of resources to build toys that distract us from the true nature of our predicament... we will continue to make life harder for the majority of people. Fear is our only inhibitor.