It seems like a good thread to start. I agree with the concept of layered responses.
It is important to prepare for the possible disaster itself and the chance you might get caught in it.
I think it is also important to prepare to avoid the disaster if possible and to prepare a recovery plan for the aftermath.
I think a properly planned response has to include a reasonable bug out plan as well as a provisioning plan in case you intend to sit and ride the situation out.