The former Paypal COO believes cyrptocurrency is fulfilling the company's original vision of a database of money where it never left the system. As far as ethereum and the ICO market, David says the "technology is probably 1995 and the pricing is either 1999 or getting close," the true combination of something real with a whole lot of speculation.
First, the number of transactions per second that either bitcoin or ethereum can handle is still orders of magnitude less than what PayPal or the Visa network can do. It's been estimated that ethereum, which is the main developer platform for decentralized apps, would need a 250x improvement to run a 10 million user app and 25,000x improvement to run a billion-user app like Facebook. That improvement requires real work and involves some risk. There's a product roadmap, but it's going to take years.
https://www.cnbc.com/2017/08/14/david-sacks-cryptocurrency-interview.html