No one can say for certain when bitcoin bubble will burst. In fact, bitcoin bubble bursting may not happen because it may not be a bubble in the first place. If bitcoin is really a bubble, it is the first time that I have seen a bubble being so resilient despite many people calling it a bubble. It will probably never go down to never recover again because adoption rate is increasing so fast, it even got legalized on some countries. Many people uses it too and unless they stop using it, rise and dump wont stop.