I am not sure in anything but what I can see is that other countries from South America like Panama, Brasil, Nicaragua, Paraguay and Mexico, are following exactly what El Salvador did, and more countries from other parts of the world will follow.
People don't understand that global adoption doesn't mean that you will be able to buy coffee or beer with Bitcoin, but you will use as back up especially when current fiat currencies crash and burn in near future.

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 you to spend it now, rather than keep it.
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Better ask Venezuela, Nigeria and other countries that had hyperinflation can they buy something with their local currencies, they are faster and you can use them to warm up if you are freezing in winter.
Bitcoin will never be used as main currency in any country, just like you are not using gold or silver to buy anything but they still value more than fiat and paper money.