There's a new set of transformative technologies such as machine learning, AI, and virtual reality that will spawn another set of big tech franchises. But in terms of cultural impact, perhaps we are at peak Valley.

I think the idealism has always been marketing. Even back in the early days of Apple and the 'pirate' mentality, they were building a computer that they wanted to differentiate from IBM and Microsoft.

For decades, technology entrepreneurship has been revered, and people like Steve Jobs and Elon Musk were heroes.

The one thing that Airbnb had was, Brian and Joe were designers, and they did a great job. They also had Nate Blecharczyk, who was the CTO, who I describe his history as a high schooler and at Harvard as really a creator of tools for spammers.