I feel like 100 years is a little bit too conservative, especially since the adoption of new technologies can go extremely fast. A good example is the rise of mobile phones. In 1998 nobody expected people to walk around with mobile phones (check out this dutch interview: https://www.youtube.com/watch?v=TNwhIHqM60g&t=17s). Little did these people know that only a mere 20 years later two-thirds of the worlds population would have a mobile phone connection. So there's absolutely no way it's going to take an entire century. It's either going to get adopted really quickly or it's not going to be adopted at all.