It is not certain if bitcoin will be here for a lifetime. There is still a tendency that it will be replaced by a much more better currency. Just like the fiat currency that we wanted to be replaced with cryptocurrency, bitcoin will also come to a point that people will be tired by it and create much more better currency. But this event will be no happening within a decade starting today since I believe bitcoin will reach the point of being mainstreamed and will be accepted by all countries. But far off in the future everything has a limit and an end and bitcoin is included.