Don't forget that most of the world population doesn't use Internet. So in my opinion it would be a very bad thing if "physical" money will be forced to disappear. The best scenario is that it should be a free choice between digital and physical money, so that everyone would choose the better option by himself.
this site report that half the population are using internet
http://www.internetworldstats.com/stats.htmbut from this value you must removed very young kid, and new born, which are quite a lot, so i would not say that the majrity are not using internet
and certainly this does not mean that they are not using some form of electronic paymen, you don't need internet to pay with credit card in a phisical shop...