I do not think that Bitcoin will be able to eat up all the organizations and currencies in the world. It takes decades to replace the fiat and decentralized world, and Bitcoin is unlikely to do so. However, in my opinion, what should change the world will base on the Blockchain
No it won't, I think that we are just the ones thinking beyond the vision of bitcoin creator himself, the creator of this coin made it known to everyone that it is meant to serve as alternative to fiat and would be more useful within the network of those that believes in it, I mean within the people that will be a part of the 21 million limit that is set on it.
It is impossible for it to take over the world because the world is too big and being controlled by world powerful leaders whom some of them would never agree to its usage while some of them would agree, but than God that it is an internet money, and will be more used by those who are technology incline. so that dream that it will eat up the earth one day is one that I think will never come through.