I think nobody can control or own the bitcoin system like they can not control and possess the technology by email and the internet. I think Bitcoin is no different than a mobile application or program that offers a personal Bitcoin wallet and allows users to send and receive Bitcoin.
I think market control bitcoin. because of decentralized system attached on bitcoin, its volatility proves that market puts its hand on bitcoin. Miners and traders are players that take profit from the volatility of bitcoin.
Not only markets, i think the news controls Bitcoin also, if they just release some bad news about Bitcoin like Bitcoin was banned in somewhere than the price will be dropped insane.
The market will be a mess if there is a crazy news also.
Of course many bitcoin schemes are one can be an influence in market prices. besides the demand from the market itself that makes it down or up. so far I think it's someone who can control the price. people who have enough money