Cryptocurrency crashing from high, I suppose it can go further down

A virtual currency no matter you are going with the best technology in the world. First of all a value defined. When it defined then how it can grow from demand and supply? How will you trade a currency with a product that can go up and down hundred percents. In human civilization is the first time. But it will back to basis and then stabilize to grow correctly. Until then, there are still lots of space to head south.