The US dollar is backed up by you have to pay your taxes in US dollar so the US economy is going to accept US dollar, thus, if you have dollars, you can buy shit in the US. In effect, thus, the US dollar is backed by the US economy.
There’s no such mechanism for crypto coins. If you now say “well the Fed can just print money”, that’s US policy. The Euro works differently, there price stability reigns supreme, in any case the policies of both Fed and ECB are well-known and people trust that they don’t change willy-nilly because neither the US nor the EU has any interest in the fallout that would cause. That trust is in no way weaker, less of a guarantee, wrt. giving a hint at the future value of the currency as the collective faith that props up crypto coins as a unit of account.
And gold, btw, is practically useless as a commodity. Jewelry? Literally only used for that because it’s expensive. Technical applications? Do exist, but the amount needed is negligible. The value of gold relies on the existence of a luxury market.
So we’ve given up on making family and career compatible, I see. Test tubes babies it is, then.
Migration won’t help long-term btw the last big countries (e.g. Nigeria) are going to have their demographic transition around 2050, themselves starting to shrink. Ultimately there’s no way around getting birth rates up to hovering around 2, again, and with that I don’t mean “we can’t have fewer or more people on the earth” – both is absolutely doable. The issue is the absolute havoc that too large or too small (net, that is, modulo infant mortality) birthrates have on society: Either you have a young powderkeg, or old, stagnant, gerontocracy. Social stability (as in homeostasis, not stagnation) requires the birth rate to be within a sensible band.