old is not the standard store of value, the U.S. dollar and the Euro are. Gold is a commodity whose price moves up and down, seemingly at random, like other commodities. It’s value is quoted in dollars or Euros.

Bitcoin is very unlikely to replace any of the above. It has become another commodity. Someday a virtual currency may supersede the others. It would have to be by international agreement between the major nations, and regulated by some central bank or similar institution. If this ever happens it won’t be within the next 50 years.