Bitcoin will die only if the price of bitcoin falls to zero level but I don't think that is ever going to happen as price will keep on going higher and higher in future as and we will see more people start adopting bitcoins in near future;
Of course if the price crashes any coin will die. But this is the result. What is the cause where the bitcoin price will be zero? To my point of view this will happen, if people loose their faith about bitcoin; If people go to the next big thing; That means bitcoin has value because people want it. Therefore, if they stop to believe after a while bitcoin will die.