TLDR: Venture capitalist claims the tech sector is not in a bubble.
I was going to make a similar bet but in the other direction. My instincts say that 90% of the companies mentioned would be out of business by then and the remaining in the "still-going-but-not-relevant/MySpace" category. The coming Tech Winter will be devastating to the unicorns, precisely because so much is expected from them.
But I don't want to be one of those people. A community is built by people supporting each other, up or down, Tuesday or Wednesday. Maybe Sam is right and maybe I am, but at the end of the day, let's innovate and let the future unfold how it will.