Bitcoin should perish, and quickly, for the reasons outlined. But "other cryptocurrencies" is a generalization that is too broad. Some alternatives are faster, feeless and 1000x more energy efficient. Sure, you may argue that countries may not want some uncontrollable asset to run rampant, but guess what: it's the whole point of cryptocurrencies -- a form of means of exchange that nobody can control. May not sound relevant in countries like US / EU, but look at how other monetary policies around the world are doing, run by incompetent and/or corrupt governments (venezuela, argentina, several african countries).
Maybe "crypto" is not the answer, but a form of global money that no individual country can touch, and is more easily transferrable than physical assets like gold, will emerge.