I think anyone who is in the HN environment has already realized that the people and, likely more importantly, the ability to execute* is the #1 secret in a successful startup. People outside the HN circle don't understand this though. I have friends who are still looking for that perfect idea and then they'll start working on something on the side. I just don't see it working that way, instead you keep working on the side until you morph whatever you have into that perfect idea.
*Execution really is king, but is greatly helped by being smart and fast. Basically if you have all three you can take a whim idea do it quickly and see 'what if.' The faster that someone can iterate through that process the more chances they can give themselves at finding a good business.