50 years ago, no one can imagine our digital life today. It is hard to imagine what it will be like 100 years later with the fast pace of digital revolution. Bitcoin may be gone and replaced by better coin, or it evolves and becomes an important part of daily life.
No one can predict whether our planet will be surviving for a century or not. Nobody can predict the future. In an ideal situation, where there will be no devastation and our planet will keep on making progress in a positive way, definitely Bitcoin will survive and by then humans will be living in a cashless society. However, reality is a little bit different from our imaginations. A century is a very long period for predicting anything with certainty.