I think Bitcoin as an alternative currency will not lead the world currency market. Where do you see an alternative leading the market? Unless all governments in the world accept Bitcoin as legal tender then by all means, it will beat even the USD or Euro in terms of currency ranking.
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As always. Bitcoin was created also to solve the current issues in our financial system. If you take a look and appreciate Bitcoin, you will see how Bitcoin can help us and become financial freedom compare to traditional banks or the financial systems we have right now.
For me, even though Bitcoin will not lead the world currency, Bitcoin is still the best digital currency, Bitcoin is here to stay.