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That is my point, too. Bitcoin can be replaced, by some other "improved coin", the same way Internet Explorer or Netscape were replaced. Back at the time, when these browsers were dominant, people were also thinking of them as something for their lifetime. And look where we are now.

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You might be right but you are being selective. Amazon hasn't been replaced, eBay, priceline, and many other dot coms from the early internet haven't either. We can't assume all first ideas are failures..