The states might replace gold with crypto (bitcoin likely) on long term. Eventually, the monetary system pairs gold with fiat and puts a price ticket on it. Gold must have a certain, controlable supply in order to have a stable economic system. Well, we know that bitcoin has a maximum supply and it can be given an value to trade with.

I actually think that this is the plan, it takes time for the central banks to sort out when en how. Unfortunately there will be no thing as decentralization at the end.