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.
There is a quite big factor between the support of the community and bitcoin development. So if it will be gone forever or in a scale of time a huge impact may be changes on bitcoin resulting for not having a progress notes of its price and transaction and for somewhat reason it will die in the sense that mo one will going to used bitcoin as a mode of transaction and for investment and trading. Always think that we are a factor for bitcoin development.