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The amount of sustainable usage of blockchain is very low. Although it exists, there are a lot of people giving value to cryptocurrencies, yet the amount of useful stuff happening is still much lower than the $200 billion market cap makes it seem. The main challenge for the industry as I see it is basically understanding how to bridge that gap and get to point where there is $200 billion in some sense of actual final value being generated, Buterin explained. "
https://twitter.com/VitalikButerin/status/964838207215955969?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E964838207215955969&ref_url=http%3A%2F%2Ffortune.com%2F2018%2F02%2F19%2Fethereum-price-ether-vitalik-buterin%2F