This is without a doubt a dream which can be achieved and the only thing that we need is time, even if the price right now is not in its best shape, the rate of adoption is growing every single day and there are probably already some countries in which you can easily get by with bitcoin, and I do not see any kind of reason why that number of countries will not go up in the future, probably the only obstacle could be if governments tried to enforce a global ban, but at least for the time being I do not see this as a likely move they could try.