Yes, I think that all countries that want to change their economic situation should definitely move towards Bitcoin adoption. What El Salvador has done, other countries will also do, but some will come quickly and many will come late. Any investment is risky, but those who accept that risk and invest can face profit or loss, but those who cannot take risks will never be able to make profit.
They as countries can not change their economic situations with Bitcoin. Bitcoin market is small and Bitcoin can not contribute huge weight to their national economic, it's reason.
They can make a more friendly legal environment for Bitcoin. Create Bitcoin adoption, legal tender, national reserves partially in Bitcoin, but it's only one piece of their economy. If they want to improve their economy, they will have to do more, and surely beyond Bitcoin. It can contribute good weights for small countries but with average and big nations in economic sizes, it won't help too much.
Argentina may be attracted to how El Salvador investment in bitcoin grew rapidly just within this few years they’ve adopted and bought some of them. They could possibly be looking for ideas on how to go about them also adopting bitcoin and profiting from holding an asses like bitcoin.
Argentina and other countries will be attracted with success of El Salvador but they must be realistic that with time and future marke cycles, Bitcoin will have lower ROIs than its ROIs since 2009 till now. Bigger market cap will always mean slower growth rate with time.