If one were to assume that Bitcoin is a currency and its supply is fixed then the correction assumption is that the value of Bitcoin doesn't change. The expectation is that the dollar is losing value and thus you can exchange your Bitcoin for more dollars. However, this is missing that the maximum return would merely track inflation and thus Bitcoin is massively over performing which indicates immaturity of the asset or a bubble. Bitcoin has had so many bubbles it would be surprising if what we are currently experiencing is not a bubble.