What do you guys think?
I personall;y think that even if digital currency will arise, there is still a real threat that it gets hacked, stoled or worse erased. And paper or real money would still be a go - to cash for some as it leaves a trail, traceable and can be hold in a place where you can protect it yourself. Unlike in a world where only digital currency exists the world would be at the mercy of digital hackers and it might be replicated to some degree into fake money that could prove troiblesome than it might have helped.
Hackers may hack your bank account as well. In bitcoin wallet, you need to set-up the two factor authentification and you should not share the private key to anyone to keep your bitcoin much safer side. Don't google your wallet site and try to logging in. This may take your log in encryption and decryption information to hackers side then they will loot your money.