If everyone stops using it or if in some way becomes wothless, these are the two situations I think of that could make bitcoin die. But I don't know what could cause something like this, people get used to bitcoin and all benefits that it gives and demand is geting biger all the time.
Even if it is quite hard to say when it would happened I also think that if people will no longer use Bitcoin as an option for trading or in other word will not support it it may become a current without value in the future if it will happen. We all know that Bitcoin is aligned through the development of technology where it can brought by the support of the number of people who are open on using Bitcoin as an option for daily transactions and investments. But for now as soon as people know that Bitcoin has a future and open opportunity it is a good thing for Bitcoin because it is the moment where it will continue its development rather than to stop.