There are only two possibilities in which bitcoin can die.
Either people stop using it or there comes some new currency which is better then bitcoins and if that happens then I think bitcoin can disappear in quick time but as of now I think everything is fine with bitcoins.
Very smart, directly to the point. Only these two possibilities could make bitcoin die. But there are infinity causes to reach to these two possibilities, like persons trying to sabotage bitcoin, it's the worse and most dangerous possible cause to the bitcoin failure.
And there are many others causes, we need to be aware about everything to protect bitcoin against threats.