For small poor countries it's a smart move to adopt bitcoin as currency, because they have nothing to lose. For this reason the volatility is an acceptable risk to be taken. On the other hand, if more countries like El Salvador adopt bitcoin as well, the volatility tends to decrease along the time, as millions of people will be entering on this ecosystem to deal with bitcoin in a daily basis.
I hope these news coming from El Salvador aren't just propaganda and that the legislative accept the president's proposal to make bitcoin official there. The world will be watching this crypto experience closely.