Any fiat currency simultaneously performs all functions, including as a means of accumulating value. But in bitcoin, this function is certainly the main one. And so much so that it is almost never used as a means of payment. Yes, this situation is likely to continue in the next few years. This is not very good for cryptocurrency, because bitcoin does not fulfill its main purpose yet. For now, bitcoin maintains the overall rate of high price growth, but this will not always be the case, and then the situation will change. In the meantime, the function of a means of payment is more performed by some altcoins.