"Failed experiment" is the wrong way to look at it. It was a test of strength, and the old guard won this round.
The IMF is the financial world's muscle. El Salvador tried to break away, and the IMF put them in a chokehold. It wasn't about bad planning; it was about a small country getting squeezed by a global superpower that can't afford to let its monopoly on money be challenged.
The dream isn't dead. It just got a harsh reality check. You can't escape the system until you're too big for the system to crush.