any new technology really needs time before everyone got a grasp on it. imagine, btc playing the same role with their fiat? fiat has been there for decades and decades so yes, they should be more considerate when it comes to adoption of btc because el salvador has just implemented this as legal tender for just a year. so they should not expect that the adoption is already the same with their fiat.
Whenever something reaches the market people find it hard to get used to it. Later slowly things change when the real value of the same is being enjoyed/experienced by some means. The same is the reality of the adoption from El Salvador. As said just think of our bitcoin, very few were interested on bitcoin at its early days. Those people have made it reach the world and it is successful. Same as this with time we'll experience the success of El Salvador and for the reason the adoption isn't a failure.