Pandora box is open and it can't be easily shut. Forks cant do it, B cash cant, Mt Gox cant, Jamie Dimon cant, China ICO ban cant do it. The network effect has started and more and more people want in which just continues to fuel. People will stop buying bitcoin if the code was hacked. I think theyve tried and for 9 years, nothing. The network can be spammped with fake transactions but to my knowledge, no hacking has happened.