Bitcoin didn't shield El Salvador from disruptions in the world economy, it didn't enrich its citizens, it didn't protect it from foreign corporations plundering its resources for cheap etc.
Was it supposed to, how was BTC supposed to 'enrich' their citizens when most of them didn't even understand what bitcoin is, never mind buying it. I don't know how some people expected BTC to lift the nation out of poverty, they can earn some profits if they buy and hold, which their president was doing, but that is not enough to change the country's financial situation.
Bitcoin is not a get rich quick scheme to kick poverty out of a country, it is a decentralized digital cash that became a store of value because of it's potentials to reach ATH in every bull circles. Let us remember that Bitcoin is a volatile asset it is best to hold it as an alternative source of income for individuals, institutions and countries, relying on it to stabilize the economy of a country like El Salvador, is not feasible. El Salvador, and other struggling economies should look inward and find proactive means to leap them out of poverty and dependance on organizations like the IMF for loans. I wouldn't call Bitcoin a failed experiment in El Salvador, because it wasn't meant to be a palliative out of their struggling economy, it is an asset that anybody or country can hodl for profit on the long term.