When I first learned bitcoin, this was really my point of view, like having a race with other currencies, whether fiat or gold. I kept always thinking about replacing them with bitcoin, but when I really got to know bitcoin more, I think let's set aside this thinking since bitcoin wasn't made for this to replace everything (though if this will really happen, then I'm sure it is for good) since bitcoin has his own uniqueness. No matter what will happen in the next 20 or 50 years, as you've said, I hope it is good for us holders and traders.