From the America history we can know that America was a Deflation economic system in few years. At that time USD was maintain and the prices was keeping a low average. This why we need a 'something standard' monetary system but not a credit credentials paper.
You can imaging that if some 'third world countries' become a 'Bitcoin standard' monetray system , and show the Bitcoin savings address, what will happen?
Bitcoin will not be issues over the maximum supply ,and nobody can make a 'fake bitcoin'. These country need to save x bitcoin to issue their monet, they will have a healty economics system, the other countries will happy to keep their money and want to trade will them.
People won't be afraid of inflation , and the prices will not go high in a long cycle times.
We with our hard work are the only one escape of the problems we caused cause this is the world/nature we changed. We can significantly improve economical situation of every living human but will that happen? No cause we have selfish billionaires, lazy people... We have wars between us for no reason or for the sake of 1-2 person who just get pleasure from it and soldiers kill each other to show them show.
But in this situation bitcoin can be a solution cause they won't be able to fake something that's with fixed value like bitcoin. We don't even need local currencies, one global will be great but trading is a huge business in some countries.