All of these electronic currencies like bitcoin, erethium, dogecoin are "investments "....not currency. Like the stupid digital monkey pictures.
Bitcoin is only worth what someone is willing to pay for it....like a house on a 5 acre lot. If the house is in Manhattan....big big bucks. If it's in the middle of decrepit Detroit....not so much. It's value is in the demand and not the supply.
Currency is valuable as a medium of exchange because of legal mandates and market forces. The GDP, fluidity, volatility, inflation rate and etc all determine its value.
The Russian Ruble is fading fast....not worth the paper it's printed on. And after it fails you can watch closely as they issue new currency after new currency trying to get a stable one that will trade. But their level of corruption is such that last time it took three different ones before this one. (Which is fading fast)