"Doomsday" scenarios are worst-case scenarios that are obviously entertaining for the masses, and perhaps on some level motivating for folks looking to put traction into their own readiness activities. I personally acknowledge worst-case possibilities (Hurricane Katrina, the Indian Ocean Tsunami, and last year's Japanese quake and Fukushima nuclear disaster are a few recent examples of the dangers that exist even in a modern world), but I try not to affiliate our company with scare-mongering. It's sometimes a fine line where we have to talk about preparedness without going overboard. We look to appeal to serious, normal consumers.
That said ... I will pass along the contact info where you can can get in touch with the Casting folks at NatGeo for this next season. They are actively looking for people who are seriously into preparedness. My hope is that some normal, mentally stable individuals with an abundance of common sense and good camera-presence will be found for the next season.