hey @amiramnoam,

isn´t the main question how one can get all the money out of his wallet just by having the private key? I think more importantly should be the question why has your friend not put additional security messures in place such as 2-fac-autorization or even higher implementations?

I truely believe that your friend has partly fault as well as he made it the thief that easy to get his money.

In terms of your main question whether digital currencies may be able to replace fiat money I do think a change is already taking place and it may only be a matter of time until banks will be outdated - at least if the do not addopt and add digital currencies to their portfolio.