I dont think btcs can fulfill the double demand. One side is asking it to be used as currency and other as stock. How can it be stable then?
at the present moment, it is not possible for bitcoin to be used as money or governments are not allowing so but still there are many companies and websites that actually accept payments plus donation in the form of bitcoin and bitcoin cash. If have not checked for ethereum or other coins but if believe they are also being used this way. However, it is investors who are not willing to spend their coins at the moment because of high profits these can give.