They don't control the world with bitcoin. They control the price because they have so much money and bitcoin. They get the whole world to invest in bitcoin and then crash it destroying all that wealth for good.(apart from a few smart investors who cashed out before the crash)
Bitcoin wouldn't even be used as a currency in the future, when all the bitcoin has been mined, whos gonna use bitcoin? Whos gonna mine it? Theres many other things that prevent bitcoin from being the currency that we will use. If it's not illuminatis plan, bitcoin will still not be the future, some other coin or probably many other altcoins will be used for different things. Bitcoin was only needed to kickstart the blockchain revolution. Just like anything in this world, bitcoin will die off and will have many successors.