According to the report of Goldman Sachs, Bitcoin and other crypto-currencies can be a good alternative to the national currency for countries with an unstable economy.
It can help somehow specially those countries with hyperinflation status like Zimbabwe and Venezuela were money almost useless as a tool to purchase anything. In that case Bitcoin will soar because of the demand, and people in that particular country can enjoy the benefit of it. The only question is, will their government will allow circulation of cryptocurrency?
Maybe with digital currencies can be a solution when money is no longer valuable right? because between digital currency and ordinary money are also different so in my opinion this is one option from the government in the process to get out because of the economic crisis in the country