The wallet ( I am telling about official wallet ) will never get hack until we expose our all the details to anyone .
Well here the owner of master key is only the network of the blockchain , not the Satoshi nakamoto or any other person , because this is
Not a matter to handle all the transaction and details but also making all the transaction fully safe and secured , so I don't think anyone in this world has theaster node key of the Bitcoin , and I would like to advise the any of the authority of the Bitcoin that don't try to get into to get the control of the transaction other wise people will use more and more to go against them .
So instead to get master node , the governments needed only to make better rules to use Bitcoin our own ways .
I think if the government takes over and controls bitcoin it will certainly change the rules and systems that have been run by the bitcoin system.
Even bicoini may no longer be a decentralized currency, because it has come under the control of the government.
still its hard for government to takes over bitcoin and controls bitcoin because bitcoin is not designed for centralized currency. governments attracted with bitcoin because now many people using bitcoin and makes money from bitcoin. since bitcoin is not controlling by any one, governments can not takes over and controlling bitcoin.