We can't know whether Bitcoin will exist forever. But under the current circumstances, we can be reasonably confident that it won't suddenly disappear. If it ever did, it would be an extremely rare event and completely beyond our control. The same could happen to any other asset as well, and no exception. So thinking about it is unnecessary and a waste of time.
Yes, no one knows if Bitcoin will be around forever, but I am very sure, Bitcoin will not disappear suddenly because its network is decentralized, it is almost 17 years old, during that time it has been able to survive various crises that occurred in 2013, 2017, 2021, the Chinese ban, FTX collapsed, but the network is still running. Bitcoin is also starting to be adopted by countries like El Salvador and several large companies, the more parties consider it important, the stronger its presence becomes. Having come this far and survived all the challenges, it would take an extraordinary event for Bitcoin to suddenly disappear, such as an internet apocalypse, a nuclear war, all developers quitting, or a fatal bug that cannot be fixed. I think the probability is very small.
Now let me take a real-life example. No one can guarantee that a plane will not crash, but we still fly because the pilots are professional, the planes are well-maintained, and the statistics are that they are safe. If you keep thinking about the plane crash, you will only become more stressed and won't be able to enjoy the flight. I think Bitcoin is the same, we just need to focus on education, security, and strategy to enjoy the long-term results.