Bit coin is a crypto currency so the only way to destroy or make the value zero is complete shutdown of internet around the world. And I my opinion it is not possible. Another issue in this topic which can be discussed is some government are concern about the activity of bitcoin like china in few days ago, it had a great impact on the value of it, the price went down. But now it become more valuable than ever. Every currency price goes up-and down so does crypto currency. But it can not be zero.