Your personal opinion is that bitcoin is worth 2-5K. Others value Bitcoin at $1M. It is all relative and will only be as valuable as the demand makes it. There is no bubble, rather an increase in interest, and a wildfire burning out of control. I believe that the bubble will happen when more than 10% of the general public gets into Bitcoin, and pumps the price to highs of 200 - 500K, then we may see a bubble pop, price reduction to around 75K, and then it will go back up over time. I say its not really a bubble, cuz to me for something to be a bubble means when it pops, there is nothing left. Every-time Bitcoin corrects, it rises 100% or more afterward. Bitcoin is here to stay, and those refusing to believe so are going to kick themselves later.