There are some goals that are mutually exclusive. or instance: a government might issue a cryptocurrency and require that their authority maintain the ability

There are some goals that are mutually exclusive. or instance: a government might issue a cryptocurrency and require that their authority maintain the ability to issue new coins at their direction; another cryptocurrency (like Bitcoin) has "no centralized issuing authority" as a core design decision. The vast majority of existing cryptocurrencies are just copies of others, or just sit atop Ethereum. Those will certainly end up being worthless or nearly so. That doesn't require that all future cryptocurrencies will necessarily meet the same fate.