Bitcoin was supposed to be used as a currency, not only a form of investment. However, it's been more successful as a form of investment, a "speculative asset".
Yes, Bitcoin is supposed to be a currecy but in unknown reason it became a good asset for investment. For me it doesn't matter if it will be an asset or currency the things is, it will be be useful for everyone. It doesn't matter if it failed as currency but it should be success for being an asset.