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...
I think those government who not accepting BTC are in wrong site yet. Has they stop to use BTC from his inhabitants ?? i think no. People are doing their trading and using in different way though it looks illegal to government. In this technology world no body can not control anybody that he want to do. I think it would be better if government accept it and make some rules and regulations and people will easily accept it and will do their business legally. In this way both will be gainer.
In the far future bitcoin will definitely take over the market because it is the future currency and the world is turning towards digital currency. Fiat will be for some time and when bitcoin is acceptable globally then it will take over fiat currency also. When there is bitcoin, we need no other currency paper or fiat. Gradually the use of bitcoin will increase.