It wont be accepted as a global currency until some regulations are made. But digital currencies will be the future but not very soon as we expect. Bitcoin will force governments to take digital currency right away.
If that is possible and you also can see now already that there are now more people that is using it and that there are also more stores that is accepting it.
But you have to also know that there will be a lot of people that must have to know to use Bitcoin and get to know about it.
Yes it's true Bitcoin will take Time to become a global currency especially when so many people are unaware of its advs. My friend doesn't believe in Bitcoin. So it will take time and soon the whole world will accept it.