The possibility of Bitcoin becoming extinct, of course there are several factors such as the internet in the world being completely dead and that is the only cause of Bitcoin becoming extinct. The world is experiencing a third war that uses nuclear weapons where all the access we use today goes back to the stone age. But of course this doesn't happen all at once, there are stages that need to be gone through. Do we expect that to happen? Of course not and hopefully that never happens.
Of course when the internet is gone, probably the usage of bitcoins will stop because there are only a few people who can trade it offline and it is still complicated for a simple person who barely uses his computer. therefore, we will go back to the traditional way of trading which is gold and silver just like in the old times and when the internet won't be back again then eventually the next generation of human civilization will forget about Bitcoin until it becomes extinct and no longer usable.