Bitcoin could die if there is no one left who uses it. Until at least one person uses it, Bitcoin can't die. So obviously Bitcoin never die 
What a simple theory 
Anyways, besides this, there are many other cases that bitcoin could disappear. For instance, terrorist attack on the whole mining business and since we can't mine bitcoin, everything will suddenly stop, or when there is another altcoin that is more appealing and potential than bitcoin, the number of bitcoin users will drop and one day, it will die out like other weak cryptocurrencies. But all of this seem totally impossible for me so no need to be worried