Bitcoin serves as a digitalized decentralized currency created and it is clearly stated on it's whitepaper that it's creation is to eliminate the involvement of a third party in a transaction and to prevent double spending in a transaction.If it was stated on it's whitepaper that the primary goal of Bitcoin was to replace the traditional currency there would be an endless war between the government and Bitcoin in terms of accepting the new monetary policy.Even amongst bitcoin enthusiasts they're lot of people who don't use Bitcoin for their daily transactions,to me Bitcoin is more of an investment vehicle than a payment option because it's hasn't been widely accepted in some countries.