I personally don't think paper money will completely disappear any time in the near future. It is true that electronic transactions have become more and more common over the last few decades and I see no reason why this trend will not continue. We may even get to the point where paper money transactions become incredibly rare. At that point, the tables could turn and what we now consider paper money may actually act as the backing to our electronic currency, the way the gold standard once backed paper money.
With electronic money there is question of privacy security and many people don't believe in electronic money they still prefer physical money and this will prevail in the future too.
Digital money is very develop now in most of the countries because using of digital money is easy as compare than paper money but keep in mind that paper money have his own value everywhere and it is not possible that paper money will complete disappear from the world because without paper money currency is not possible of any country.
The fact is that to date electronic money occupies a very low place in the financial sector in the world economy, but we must also take into account the fact that many people are not ready to use crypto currency. The fact is that to use crypto currency, you need a lot of specific knowledge and even education.
But a lot of things happen without people getting ready. Was the world ready to be filled of the Millennials who are constantly depressed, pressured, and on the verge of suicide? I don't think so. The world becomes what it becomes and as humans, we tend to adapt with our environment. Even if you are dumb, once everyone starts using bitcoin, you are also going to start using bitcoin. There are people in my place who have no proper education yet they are using Smartphones. Smartphones have English as language and that should be really hard for them. Yet the developers have made it intuitive by using corresponding logos that can easily be remembered by the user. I think the same thing was done with bitcoin. Online wallets are pretty intuitive and self explanatory.
It's their problem to deal with if they are not ready to use bitcoin yet. Once it becomes mainstream, they have no choice but to adapt to the environment because everyone is already doing it.