Why not having more than one currency in country and you let the citizens decide what they want to use legaly, not charging them ridiculously high taxes like now.
Because they cannot control it. It's that simple. Are you sure that every other country will behave same like El Salvador did?
I hope they all adopt it and maximize this global adoption, because I have bitcoins.
Let's see what country will accept Bitcoin as legal tender next and then we can talk more about global adoption.
There's a difference between adopting Bitcoin and legalizing it. Yes, you can make it legal to use Bitcoin, but will there be places to use it, you know like... locally? It could surely provide a great way to purchase from the other side of the Earth, but locally, it'd be better to use your nation currency. It's faster, it costs less to make a transaction, you don't have to dedicate some hundreds of hours understanding how it works and it'd be better for your to spend it now, rather than keep it.