It is said now China is a cashless society. Use of debit and credit cards in shops/stores, online pay bills, shopping online.
Money earned from the internet is known as digital/electronic money. People who earn money from the internet, they get paid money in electronic form by payment processors such as skrill, perfectmoney, alipay, paypal, bank-wire transfers because online workers are worldwide.
Last month, I got $20 from online surveys. The money was sent to my bank account via online payment processor. Now if I buy 2 shirts using debit cards at offline or online stores, there is no cash involved but I have 2 shirts.
Bitcoin is a part of digital money. How is digital money is your country ??
Cash is still necessary for small businesses and unlucky countries with extremely low rate of social benefits.
Those $20 dollars you got is nothing if compared with the turnover of money in the worldwide economy.
So I think that crypto has no chance to become an international currency in view of the next 10-15 years.