Governments love the idea. It’s much easier to collect taxes or punish dissidents in a cashless society.
Well, our own government has never said anything about it. If they did propose it I guess our democratic process would find the best way forward. The same could be said of a great many things that will never exist.
Also collecting taxes ought to be easy and fair. If no one cheats then no one pays too much if they do not cheat. Besides that, there’s plenty of other measures that can be applied in 2024 to diminish tax evasion.
It’s now illegal in many parts of Europe to make large cash transactions.