This is exactly what all the governments want. They want to control all transactions. they want to be able to prosecute buyers and sellers to stop some illegal actions can be easy made using bitcoin. As Bitcoin is decentralized, They can't change Bitcoin, They only try to stop people using it. In any situation a day all of them will accept bitcoin as a global currency.
Yes government wants to control bitcoin but definitely its not they dont have the power to control it because it is decentralized thats why they are regulating bitcoin. But for now bitcoin is now used by different countries as a means of payment.