It’s simple. What’s needed are (note the plural here), virtual global economic systems built on a sound footing (i.e. better and more sensible rules than we currently have), prosperous participants, and a hard currency. Systems that people can flee to when currencies become scarce (deflation) or worthless (inflation) or nation-state political systems fail (corruption/crime) or flail (repression).
My advice to you: when you see a system that looks like the one outlined above, start to diversify your economic activity into it as soon as is practicable.
A friend of mine has this bumper syicker on hos truck: “Ammo: the currency for the new millennium.” Which makes little economic sense, but does suggest that “hard currency” may be something other than currency.