That's another false conflation of the payment mechanism with the speculative asset imo. Bitcoin may well become the future of payment transactions (seems unlikely considering its energy usage and slow transaction times) but that doesn't mean that bitcoins are an asset that'll inherently grow in value. When contactless payments came along you didn't see folk rushing out to acquire lots of cards with the aim of selling them for $100k each.
El Salvador are a special case anyway, with a U.S. dollar based economy. This move is essentially a play to get more dollars into the country imo.
Follow the money. Huge financial institutions are buying up Bitcoin and crypto. More and more places are taking it as a form of payment and it's not going away. I don't see it as a pyramid scheme at all. It will go up and down in cycles like most investments do. Right now it's still in a bull market and I think we'll see $100,000 Bitcoin with the next 12 months. I've done very well buying and selling crypto. Take profits and slowly cost averaging back in. Some people will buy high and get burnt, that's inevitable. Most investor's are patient enough to hold and buy when there's a bear market.