OK, two cryptocurrencies as legal tender. My point still stands. If you give people a choice between crypto and fiat they will use fiat, even if it’s a foreign currency like the Dollar in El Salvador.
The solution for El Salvador or any other country using a foreign currency isn’t to go with another foreign “currency” like Bitcoin but building their own currency.
El Salvador had their own currency until they gave it up because their leader back then was a US Puppet.