It seems there are only two types of sentiment in the cryptocurrency market: extreme hype, where you start seeing mainstream media articles about "getting rich with cryptocurrencies," and extreme FUD, where everyone that has never trusted cryptocurrencies starts piling on for weeks about the tulip mania (we've never heard that one before) and how it will all go to zero this time.
But it never does. Almost every year, cryptocurrencies become bigger, on average. Small corrections, major corrections/bear markets, and even super-corrections (2-3 year long bear markets) are all in cryptocurrencies' future. But cryptocurrencies are here to stay. They won't ever crash to zero.