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Nothing has value unless it fulfills some purpose. Bitcoin can be the people's currency, but even that is still subject to adoption. Each alt-coin has to be valued on its intended purpose. Unfortunately few of them have nothing more than a "me too" impact. Which is why they are dying out. Just like Coke & Pepsi are the predominant leaders in the bubbly soda drink market. The millions of other "me too" drink products just died off naturally.

Bitcoin continues to be the pied piper leading the market to where it goes.

 

Alt-coins never took over for the most part.