How could bitcoin disappear? I don't think that could happen. It can reduce in value to 0.01 cent but that doesn't mean it will vanish and not be available to be used as a currency. Nothing in the online world truly disappears. That is the number one rule of the internet.
I agree, online stuff will not disappear because it's saved in data. so is bitcoin.
probably OP means bitcoin can be not mainstream or kind of thing, I mean it'll be forgotten. so it means disappear. but I don't think so, unless there's another cryptocurrency better than bitcoin.