Yeah, bitcoin does have the features to be a worldwide used currency but sadly, it doesnt look likely as the government of most countries are not really bitcoin friendly.
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15 years ago there was no bitcoin at all, 10 years ago it was interesting mostly to some geeks. And now some countries already adopted it. Don't be too hurry, the events are going with their own speed: one day bitcoin can become a worldwide independent currency, but to do so it has to work on different things including known problems like price and time of transaction or scalability. One day we'll see both that these problems are solved and bitcoin is accepted mostly everywhere.
I don't think this has to be, that is, for Bitcoin to be taken as a worldwide independent currency. I might not know but I could guess that the global Government might not come to this point ever where all accept Bitcoin as a legal tender except this is not what is been assumed here. As far as I am concerned, Bitcoin is already a global currency because those that have seen it as such have been accepting it for different things even some fiat currencies of some countries are not accepted in other parts of the globe today.