In 100 years the world will change to such an extent that it is very difficult to imagine today, and I think that some things that are important today will not play a big role then. At that time, people's perceptions of money and value may change, although it's hard for me to imagine a world that works on some other principles - so the fate of Bitcoin in 100 years is completely uncertain.
What will undoubtedly advance is technology, so while it may seem like science fiction, people have always looked for a way to become immortal - and storing human consciousness in computers and loading into a new body as needed may be possible in the future.
At the same time, 100 years later, I believe that Bitcointalk will always exist with Bitcoin. 100 years later, there will still be Bitcoin supporters coming here, posting and communicating.
As I wrote above, technology will become so advanced that forums will become completely unnecessary - it would be the same as communicating with the telegraph today. Since you are interested in the future, I recommend you take a look at the Altered Carbon and Black Mirror series
