Weird that Harris mentions ICOs as if they are connected to bitcoin.
Bitcoins are scarce and yet digital. That excites a lot of people. I am less excited by bitcoin than I am about Ethereum. I am excited about Ethereum, because that digital scarcity is leveraged to create a global virtual machine, on top of which people can build decentralized applications, like Golem, which allows you to rent your CPU, or Peepeth, which is a decentralized social network. Most blockchains applications will die off, but not all. I don't own any bitcoin, but I wouldn't bet against it. People buy paper gold.