Good point. But It's hard for any country to switch to bitcoin completely.
They will not be doing that.
Also, Bitcoin will not help any troubled economy at all since if that is the case, a lot of countries will be accepting it so quickly, why would countries ban a cryptocurrency that can help their troubled economy, right? It might be able to help people that are investing in it but I don't think it would be of a major help that it can change a country's economy.