There are existing organizations focusing on "Be prepared to on your own for 72 hours." There is no reason to become yet-another such organization, especially since such efforts are beyond the point of diminishing returns: They have already reached most of the people that are likely to be receptive. Despite the resources continuing to be poured into this activity, surveys show little change in the number of families that have taken these measures.
The argument that After Katrina, people will understand the importance of being prepared demonstrates an obliviousness to history. The very same statement was made after the Loma Prieta and Kobe earthquakes and after hurricanes Andrew (1992), Charley-Frances-Ivan (2004), Hugo (1989), etc.