Did you ever see that episode of Gilligan's Island where they almost get off the island and then Gilligan messes up and then they don't? I saw that one. I saw that one a lot when I was growing up. And every half-hour that I watched that was a half an hour I wasn't posting at my blog or editing Wikipedia or contributing to a mailing list. Now I had an ironclad excuse for not doing those things, which is none of those things existed then. I was forced into the channel of media the way it was because it was the only option. Now it's not, and that's the big surprise. However lousy it is to sit in your basement and pretend to be an elf, I can tell you from personal experience it's worse to sit in your basement and try to figure if Ginger or Mary Ann is cuter.
And this is the other thing about the size of the cognitive surplus we're talking about. It's so large that even a small change could have huge ramifications. Let's say that everything stays 99 percent the same, that people watch 99 percent as much television as they used to, but 1 percent of that is carved out for producing and for sharing. The Internet-connected population watches roughly a trillion hours of TV a year. That's about five times the size of the annual U.S. consumption. One per cent of that is 100 Wikipedia projects per year worth of participation.