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.