Bitcoin is really changing the world. The idea of bypassing banking system which is sometimes not that very accessible and not that very secure. But I think the problem that bitcoin would encounter in the future is that very few people would be able to access this kind of system because of lack of knowledge and financial problems..
Anyone will be able to access bitcoin, the issue for some may be the fact that you need access to computers to be able to use bitcoin and while there are many computers and smart phones at the same time there is still a significant amount of the population of the world that are going to be unable to have access to bitcoin and that means that bitcoin has a limit in the amount of people it can reach.