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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.
coins from non exiting roman empire still have value they are not used but expensive.
I don't know future but bitcoin will live on its form or some kind fork to deal wiith problems.
Bitcoin is some king monetary sytem that i admire.