Paper money still exist in the future even dihital currency would ve more popular because not all people can have this decentralized currency that is ehy paper money is much usable to them for daily needs.
It depends. If we can promote bitcoin and spread it worldwide then there isn't really much of a use for paper currency, especially when they are issued by a government and costing them so much to issue.
Governments could even move onto cryptocurrencies themselves, to save the printing fees.
We do not need to promote Bitcoin at all. Bitcoin itself can easily spread all over the world because of its advantages and cyber-used. Bitcoin provides a lot of benefits which people can not deny. In spite of not being popular right now, I believe that Bitcoin will be accepted by most of the people in the near future
I don't think that Government will choose Bitcoin to be either priority currency or secondary currency because people do not have to pay fee to use Bitcoin and it will make the government slowly die.
Government will never die. In every times will be some number of people who will think that they are the top of the nation and have rights to rule that nation. I think in future government will find the way how to work with bitcoin to it follow their interests. And we can't get away from it.
So if to talk about the main question. Paper money are going to go in the hisory. All transactions in all currencies are going to be provided through the computer. And that's it.