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".
Do you guys think that this can change in the long term ?
I disagree with you since I myself is using bitcoin as mode of payment when purchasing online, buying game credits in steam, paying my bills and even paying my insurance. It is somehow used as a store of value right now just like gold but bitcoin didn't totally fail when it comes to currency. There are still lots of individuals that are using bitcoin not just only for investment purposes or trading but as well as a mode of payment.
With the lightning network and much lesser fees compared to last year, I think there is an improvement when it comes to bitcoin as a currency but if and only if the time comes that bitcoins supply limit will be reached and the demand to acquire bitcoin increases then I do believe bitcoin at this very moment in time will never be used as a currency but just an investment vehicle or a store of value because I'm pretty sure the value of bitcoin will skyrocket.