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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.
bitcoin is bitcoin forever maybe theres such a thing may change in bitcoin or maybe it will be upgraded or down graded or maybe it will be shut down or rise but it is really bitcoin forever and nobody knows how long does it goes or maybe take its place to forever because everything in this crazy little world has a begining and its ending so then we can really not asure how long does bitcoin last but at tbis present time as long as theres bitcoin opportunity we can grab it right now it is a blessing.