Plus even in that senario what could the highjacker do? They can't tranfer coins they don't control the wallet to.
All they could do is not confirm transactions and slow the network down, people's coins would still be safe. After miners moved to new pools, the network rate would bounce back up.
What if the hijackers replace the blockchain with the fake one? All users will find their wallet empty , the hijackers' wallet full of coins.
To avoid this kind of disaster, users need re-gathering with new version of software and the old blockchain.
So it comes the initial question: the BTC community actually need a government to tell users what to do finally.
