Yup, it sure will be done by hackers if indeed bitcoin has become a worldwide digital currencies and much used by the vast majority of people in this world, let alone the vast majority who use the bitcoin is those who did have a lot of money in the world. But I am confident that the system will never be in the bitcoin take over by hackers, because in the bitcoin system I noticed that only the original owner bitcoin could unlock and find out the weakness of the bitcoin. So in order not to be exposed to hacker attacks, then we should be able to protect the wallet that we have properly and at maximum