They just brainwash you with the media only. Bitcoin do not have posibility to controlling the world economy.
I do not know how Bitcoin can control the world economy but it really does affect the world's economy, the super power state has a role to play in controlling the world economy, because their currencies are strong and they lend money to the underlying economies, follow the rules for their benefit, maybe that's one bitcoin can get stronger
Look at the nature of fiat - the current monetary system. The government just use paper to create money or virtual number through credit card to create this system under the management of the government. They use Gold as an escrow to set the value of fiat. The value of every currency depends on the amount of gold hold in state treasury.