The point that bears emphasizing is that Bitcoin is the harbinger of a new paradigm. It is the prototype of a technology and it's associated ecosystem designed to replace the current monetary model. There is no doubt in my mind or amongst those who closely follow cryptocurrencies that some other other digital coin with better technology will come along eventually and displace bitcoin. I agree this will take time, but it will not be a 'long long time'. Fiat may disappear almost completely in 50 to 100 years.