Bubble is part of the FUD discussion and also part of the devil plans. I mean this industry has never been the bubble so there is no question of bubble burst in the first place. The crypto currency has always been real being the virtual one. They have real investment into it, real dollars flow into it which gives it real value. It would have been the bubble in first place if that was hoax project and in the beta version of blockchain. Things like that always collide with the reality and gives rise to the bubble thing as people are not able to trust the greatness of bitcoin. So my first tip is not to call it as bubble.