I cannot speak for other countries as i have traveled little and only know the states.
I can say for here, Philadelphia.......... I don't see cash going out anytime soon.
There is too great an 'underground' economy built on it and I am not referencing illegal activity like drug sales ect...
I am talking about people paid under the table and many businesses that run on cash.
Maybe in suburbia it can happen sooner but in the big city (using Philly as an example) the people will find an alternative real quick if it is made illegal.
Did people in jail not used to use cigarettes for money ??
Yeah, I've been writing about it on my riddle thread for some time. We should see the war on cash escalate very quickly later this year. By next year most major countries will ban cash.
And I wonder what they'll use instead? Bitcoin should go into hyper mode and explode later this year and a few other competing currencies backed by opposing forces will follow suit and I think a global battle will ensue for which coin will be the one global currency.