It will never happen becauseevery year the money value keep decreasing due to more money printed by the government which causing the inflation and even we have inflation rate bacteria and it keeps increasing as well.
Thats is the bad effects of inflation. But the problem here is that there is no practical alternative to it. We may think like kids who dont understand how economics works and how a country is run, but we still talk about crypto becoming a mode of transaction in the global scale. Thats very much unlikely even if one country is set as an example.
There is no taxation system of bitcoin making it a nice tool for some people out there but looking out in the broader scale, who is going to run the country with the tax money is no tax money is coming in? There is literally no explanation to this unless some consensual body is going to collect taxes from bitcoin transactions.