It would be awesome if the US decides to do that, but I don't think it's very realistic right now. The volatility in the bitcoin market is still too high for it to be a good store of value for everybody. Historically the Gold price has kept it's value for a long period of time, we haven't seen a price drop of 50% in a few months before with it. That is why it's so attractive for the older generation as an investment to store value. With the high volatility in bitcoins I would also not recommend my grandmother to invest in it. She is above 90 and at her age I advice against investing in stocks or cryptos, she still holds a bit of gold but the most she invest in is short term bonds. For the younger generation this completely different, the longer the investing horizon I would recommend to invest in cryptos rather than gold. The thing with gold is that it's good to store value, but you have no more upside potential. There is no chance that gold will rise 50% in the next 6 months, whereas with crypto currencies you can store your value long term as well and still have a chance to make a nice profit.