Bitcoin was never a currency, most of people use bitcoin as an alternate and anonymous payment method without higher transaction fees while others used bitcoin as an investment.A currency is backed by bank or solid collateral but with bitcoin there is nothing like this.
Alternate currency, it's the right name for bitcoin at this time but it will grow become the main currency(digital). I can't call it a currency because based on bitcoin is not have a physical form. But every time the definition of the currency always changes.
To buttress, Bitcoin is not yet a regular currency. The use to attain this currency state is being deprived by the preach of buying to store which is expected due to the volatile nature of bitcoin. No one still see bitcoin price to be stable in the foreseeable, however, it virtual state still limits it regular exchange at every thought transaction of which will require improved technology with association with bitcoin innovation.