To illustrate the size of cryptocurrency (MC 400 billion total), the stock market dropped $4 trillion today.

People keep talking about the cryptocurrency bubble and just to point out, if everything went to zero today it would be one of the smallest bubbles to occur. Only about 10% of the dotcom bubble and 1% of the real estate bubble. The stock exchange dropped $4 trillion today and that equates to an across the board drop of 2-3%. Cryptocurrency still has a lot of room to grow but there are many coins that will (and should) disappear.