Now it's a bad time for cryptocurrencies like bitcoin, ethereum, ripple etc. Will these currencies come back or will buried?
Cryptocurrencies are not going to rise again anytime soon. There are a number of reasons for this, the most important of which is that they are highly volatile and their value is largely dependent on speculation. Additionally, there are a number of regulatory obstacles to their widespread adoption, and there is little evidence that they offer any real benefits over traditional currencies.