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.
indeed bitcoin able to provide positive things for many people but as a user we also difficult to predict when and how his fate for a few more years and the most important we believe that bitcoin will continue to increase every time for the sake of survival society for the better.