In 100 years there is maybe the Bitcoin V43.2124 Fork if it is better then. Or we will be slaves to our AI masters. Or we are already in space discovering the universe. Who knows. Better plan for the next 2-3 years as technology advances, it also accelerates the progress of humanity.
it really depends on the next generation and what will happen in the future it's hard to tell if bitcoin is going to survive for the next hundred years because when that happen maybe we were probably gone and it's the next generation of people will handle your bitcoins if you have one, but as of now i don't think bitcoin will go down back to zero it can still survive for the next few years.