If you talk bitcoin, then it will be the same as with any other financial bubble. It will burst. But it will last quite a long time, because the system is "sharpened" to automatically reduce the issue of coins to miners. The reason for the collapse can serve anything. For example - the mass retreat of the miners due to the fact that too much power is needed to continue to "hold" the system. Or the fact that the "last fool" will finally be found, and the massive draining of the "wrappers" will begin. One way or another - "bumsyk" is inevitable. But if we talk about the idea of ​​crypto currency in general, then it seems to me that everything is much more promising. The financial situation in the world is becoming more and more heated due to a small flaw in the modern monetary system. Namely, the Fed is releasing the currency as they want, and they also demand to return this money with interest (this is the so-called "discount rate.") And where can you get new money to repay the interest on the loan if the money is printed only by the same one The Fed? Correctly - again to take from the Fed, in order to pay off the interest on the past loan. And so on ad infinitum. In this sense, the idea of ​​a new system for issuing money is quite reasonable. And this is only my guess, but it seems to me that even in our lifetime the principle that bitcoin is currently working on will be laid in the basis of the future world monetary system.