So in past bubbles it was:
1. collapse of biggest exchange Mt GoX.
2. "Bans of bitcoin in China"
3. ...
What could happen now to cause price crash? I mean, exchanges are so mature now and there are a lot of them, that failure of one exchange wouldn't cause big price drop.
What do you think can cause price of bitcoin to crash?
A serious price correction after the Japan craze dies down as a result of profit taking. This is indeed a bubble, if the price goes really South, like China, Japan may issue financial guidance to its citizens, or enact regulations. That will solidify the bear market for a while, we would see a serious regression, then new highs.
But I don’t understand the point that how is it a bubble ? According to me I think it is the real strength that has been created by the demand from the people for the adoption of the Bitcoin.
I guess the regression can only be a doubt because the price still is persistently increasing and tends to increase in future.