Pardon me for overthinking, but as this is the 1st post of the OP with the included link, I assume that this website was either owned by him or was hired to do link building on his behalf.
Regardless of the reason, predictions are predictions. Assumptions are assumptions.
We just simply do not know if it’s really going to happen or not. I could be right or wrong though. The real answer is to wait for 8 years and see if El Salvador will indeed going to be what the OP says.
But for me, I have a strong feeling that it is highly unlikely after 8 years.
8 years is a decent time in which progress should be measurable in an upward direction, and I doubt that it has to be an all or nothing thing in terms of having a variety of ways in which any country will have successes and failures within its decision-making and even resources that it has available and how it uses such resources. Even though bitcoin is one of those asset classes that is likely to continue to gravitate value into it, it could take 20, 50 or 100 years for the bitcoin to become the dominant money system. There seems to be a lot of crazy implodings that are going on in the various current fiat systems, and if they can be kept afloat or if the disasters become way too cascading can also affect various countries in the peripheries.. and maybe some of them are going to start investing in bitcoin too.. overtly or maybe even sometimes covertly.. even though governments are suppose to have some public disclosures in terms of what they are doing with public resources.