Unfortunately, this debate is focused on the wrong thing. Bitcoin's primary significance is not about whether it supplants cash. It's about a revolutionary computer-science breakthrough that has the potential to upend all sorts of established industries.
Here's an analogy: Email was the Internet's original application, but 40 years later we all recognize that the Internet has countless more uses than just the electronic exchange of text. Likewise, currency is Bitcoin's original application, but Bitcoin will not ultimately be defined by currency.
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