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 ?
Yes ofcourse.
Bitcoin is proven a kind of business where lots of people can benefit. Thus, the productivity of this cryptocurrency will lead into such series of studies that will later result into development. If people tend to appreciate Bitcoin procedures by its development, it might lead into acceptance of the majority to make it become a currency.
Furthermore, I think it is already a currency since lots of transactions are processing by Bitcoin. With that, the future of digital money is already there.
We have to believe it and appreciate the innovations.