As we can see now everyone/every developed nation is moving towards digital currency. In your opinion how much time is required for digital currency to take over the current/existing market or it is impossible that digitisation will never be successful. If yes what are those factors ? In my opinion those countries which are not accepting digital currency, are doing wrong. They are only thinking about the tax. They are saying that we will not get any tax and digital currencies are fake. Fraud is very easy in digital world (that is true but it also happen in every market). Although when someone is doing business in digital currency then that person is bringing money to country that is beneficial for the country...
Do you mean digital payments or digital currency? I know in the United States, we are the reserve currency of the world, so to forklift fiat money out of the system (and that's not just in our banks but all over the world) then I don't see that happening any time soon. However with countries with volatile governments and therefore currencies, I can definitely see the play for digital currency. You see this happening in Venezuela and Iran...
But the fact is, governments make money off of making money. Will they contribute to a new payment mechanism that takes them out of the game? As for fraud, if there is regulation...when does decentralized become centralized again??