If more country don't accept it. And also the things that could have an destructive effect on Bitcoin could be a collapse of the Internet, A global Power outage, The sudden disapearance of technologie through a global catastrophy.
In truth my friend, at the start no country have accepted Bitcoin yet but it did not end. So why are you implying that it will end if that would ever happen?
All of that would only happen if a serious phenomenon happened. I want to think sci-fi-ish here so, more like alien invasion, zombie apocalypse, and even war. I think war would be the closest thing for this. If the war resulted a mass destruction to the world, then eventually we will lose this technologies you've just mentioned.
we cant hide the truth of it that someday it will be yet there is no forever but this is was just the question that what if it may happen , bitcoin can die anytime cause no one of us cant admit that it will last , yes let say as long as we adopt this kind of currency it will run and no one can stop but how about bitcoin by itself do the thing that we are all afraid for.