It is said that bitcoin will destroy the fiat system but i believe that if this happens the world will change completly because banks and a lot of things will go out of market.
I think if everyone already knows how the transaction process and how to get bitcoin maybe everyone will use it and legalize in the coming year because if all does not change into digital currency then the manufacture of paper money that needs wood will spend the forest land on this earth .
I think it's not easy. Although you know about Bitcoin or you have some Bitcoin but it doesn't mean you can use it cause Bitcoin is not legalized worldwide moreover there are some countries banned bitcoin already so people whom living in these countries can't use Bitcoin although they have or know about it. To legalize Bitcoin is not an easily process cause it's really hard to control to avoid someone will take advatage of Bitcoin disadvantage to do bad thing but I think to make countries banned Bitcoin already unban is the most difficult.