Bitcoin is never going to be extinct
I believe its consensus will be higher and higher in the future.
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.
You said people will be tired with bitcoin? I don't think this gonna happen in next five decades if people are not tired with fiat and gold I think they will not likewise be tired with bitcoin as more people get to know BTC the more users of bitcoin will emerge thus making bitcoin to be an alternative means of payment globally thus erasing any chances of going into extinction.