In my opinion, a 100 years is a really long time from now, but from projections, i believe that in a 100years time... The value of bitcoin will become stable as all the 21million minaeable bitcoin will have been mined by then and the amount in circulation will be reduced.

By then, it may probably have been accepted and the original intention Nakamoto had for it to be used as a currency might be in play. Maybe some of us will be alive to see it, maybe not.