Gold is just non-scalable and is bound to die eventually. If you think about it, if you're going to start a new country and a new federal reserve, how much sense does it make to ship tons of gold to Mars for example?

Any store of value that makes sense for humanity in the long term has to be both digital and reflect the work/real value creation process that matters in the future. I'm not sure it's going to be bitcoin but it's definitely not gold.