Well Central banks all over the world will like to continue having the monopoly to actually print Money out of thin air, they probably think decentralised ways of doing it might unseat the natural hierachical process of fiat. Well bitcoin isn't fiat. If the world adopted it totally including central banks im there would be the issue of competition. When People are poor, they don't care but immediately they start seeing other means to be financially independent, institutions like the bank of England will begin to suffice.
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They will keep that power, by force of necessary. We have to ready for the wildest kindZ of attacks at some point.