I think if bitcoin will survive in the next 100 years it will take a very long time because not everyone will probably use bitcoin maybe people only know it but do not use it and i'm sure bitcoin will continue to be popular in long time
I think that Bitcoin has already survived its most difficult time and now it can only be better. Nobody can predict what will happen in 100 years, but we can assume what will happen. Thanks to the analysis of the market, you can conclude what will happen to Bitcoin, for example, in a week.
The forecast for the week is much easier to build.
I think that sooner than in 100 years another currency will appear, it will be more perfect than bitcoin. Perhaps bitcoin will exist, but its popularity will be very low