Currency is just a part of MONEY.
Bitcoin is - within the current context we live in - a Store of Value First, a Medium of Exchange after.
TODAY, I'd rather spend BROKEN MONEY, and SAVE IN BETTER MONEY.
LATER, more people will ask for better money as a reward in their value exchanges.
People need to understand superior store of value FIRST, before they start asking it as a reward in their value exchanges.
