It is so encouraging that Twitter's CEO says this. I think the difference between him and guys at Google and Facebook is their sense of realness. He is real while others pretend to be real as a vice, not a virtue. How dare they act in ways to suggest cryptocurrency is a fraud.
Yes, bitcoin has come to stay, and within short years, it's going to be the currency of the internet and that of the world.
And Blockchain technology will take over every sector in applicability and implementations