Many have little faith in bitcoin, It won't go down that easy unless there is something extreme happens to the world or connection between the internet, But for many years of existence it becomes higher and popular and nobody ever successful in destroying it, Many have made their bitcoin lost in purpose but nothing happens to the price of bitcoin, Many have failed and right now just try and savor the value of bitcoin.
The history of the bitcoin will be proof of its future.. Since 700 B.C. money is used in many forms (such as metal,paper).
And now it evolves into bits and bytes and 0 an 1s. This is the inevitable consequence of the technology development. In my opinion, there is no way avoiding that money becomes a digital entity.
Some of the sci-fi movies also predicts these kinds of crypto currencies will be used in the future. Here is the link of Star Trek predictions for the future (https://qz.com/766831/star-trek-real-life-technology/) Imagination of the human race is the limit for the future of these kinds of crypto currencies, i believe.