In my own opinion it bitcoin may die if there is a world war and almost damage all things .
Second will be if internet dies ,welll bitcoins is mine and exist through online. Bitcoins storage will be spend only if there
is a internet ,however it will be a too impossible to happen now if so, how we may kill the internet .
Even though the internet dies, it will never stay dead for too long. ISPs and the government, especially to the powerful countries, will not let that happen. Many businesses and government agencies depends on the internet in giving their services so this will be prioritized. That was the reason why bitcoin was made decentralized in the first place.