Nobel Prize winner Robert Shiller said "I'm not sounding the alarm yet. But in many countries the stock price levels are high, and in many real estate markets prices have risen sharply...that could end badly" and he went further, he called cryptocurrencies a "bubble".
The strange things is how the 2 statements can actually contradict instead of complementing each other. The blockchain provides dates, numbers, and public records. The transparency the market needs. If the markets collapse new ways of trade will emerge, and they have already emerged - the cryptocurrencies.
Don't listen to the naysayers invest in cryptocurrency!