I don't know when bitcoin is disappear or replace but I think the bitcoin is not forever because no forever. Like said the teenagers because they are hurt by their boyfriend or girlfriend. For me, the bitcoin is not forever, the other bitcoiners taking advantage because other countries against bitcoin they think that the other countries destroy the bitcoin so they sell account to earned more money.
we actually don't know what will happen in bitcoins fate when will it be replaced? or something might supersede bitcoin? no one knows but as of now we all know that bitcoin is king and it can bring us fortune and abundance of assets in terms of value nothing can beat bitcoin now such that its a save haven assets that people want.