In curiosity, I know all of these can hack the price of Bitcoin, but the question is, which in your opinion is most likely to happen first?
I think I will go with the government ban, it is happening one by one with every countries still there are some that do not ban them, but it happening now so I think that is a given. The second one is either of the two, but I think that the most possible to happen next is major exchanger hack. It did happen with Mt Gox in the past year so I guess the exchangers are having a lot of things to keep so they are can't be hacked and not affect crypto currencies. And for me that have the lowest possibility from happening is the Block chain hack, it is alive for some time now but it is still doing fine.