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.
the first, of course, we have to admit, that bitcoin has changed the current situation and that is real, but will it be able to become a world currency? of course there are many obstacles that must be resolved first so that they can indeed become a determinant later.
the obvious obstacle is recognition from the state, not all recognize and can accept bitcoin and this takes time and cannot be easily resolved quickly.
It must also be remembered that banking is still very much needed because it accommodates manual transactions, and traditional transactions are still very much felt and indeed cannot be avoided and will bitcoin be able to do that later?