It is hard to predict but in my opinion,bitcoin would not last forever so I am taking the opportunity to earn now before it is too late. In my opinion,  I think a way to end bitcoin is if no one is using it and loses its demand,sounds impossible but if bitcoin continuously declines, it may be possible. Another reason could be global shutdown of cryptocurrency, if government all around the world agreed to one decision, they can totally disrupt bitcoin. If a world war could happen, and power lines or internet connection were shut down, and most technologies were destroyed I think that would be the end of bitcoin, and also end of human.