I think there's a time factor too...for much of 2005-2007, many of the people who might otherwise be changing the world were a.) working for hedge funds or b.) chasing social networking, casual gaming, or video startups because that's where the money was. It's only with the recent financial crisis that getting deep expertise has become fashionable again, because now there are no easy outs. But it takes a minimum of 2-3 years (some would say 10+) to go from "I'm going to change the world" to "I'm changing the world."