I think there are at least some people (e.g., money launderers) who will use a cryptocurrency even in the face of losing money, therefore it's not entirely a pyramid scheme.
In addition many governments try to move citizens to "electronic payment" (ranging from online banking to NFC credit cards). The reason is once again tracking, and as could be seen during the financial crisis it's easy to just confiscate money when it's just numbers in a mainframe vs actual piles of cash in my home safe.