My opinion is there is not enough power for cyrpocurrencies to stabilise the whole economy even for a little country. Not yet.
The main reason is flat currencies are still the most common used tool for trading and government(banks) which are still the strongest entities who can directly or indirectly influence the economy enforce their policies based on the flat currencies. But digital currencies are changing this world. It's possible that traditional banks work with digital currencies and stabilise the economy.