It is not a bubble...we are in a speculative stage but it will stabilize. That is where the bubbles becomes the normal way
I am amazed to see the response from many peopleaboutbitcoins. Actually there is a conception about it that if something is stable then it is okay but on the flip side if something is not that much stable, it shakes like anything than yes this bubble. But I think in the case of bitcoins, they are not bubble. This is the nature of them to shake up and down, so not bubble.