Those people that have insurance and evacuated, are the ones, that will really get hosed. Most of them probably are well off enough to get in their cars and evacuate, but I doubt many of them will be able to afford to live in a motel for 2 or 3 months, without any income. I doubt, that they will be receiving the charity that those that stayed are going to get.
I have been thinking of the same thing. I imagine a family, a mom and dad w/several children, who took the warnings and evacuated to a motel maybe 200 miles inland. You fill the car w/gas, take money from the ATM, and probably charge your motel room (just thinking you will be gone a day or two) on a credit card. Now you find you have no home to go back to (or no way to safely go back to see for yourself); your place of work is probably out of business, no school systems for your kids; you are close to being out of cash (are the bank ATM systems running, I doubt it), and after a week or two of staying put at your evacuation local, you have maxed your credit card. Then what do you do?
No house, but still a mortgage; credit card bills, maybe a car payment on a second vehicle that you left behind. You are ruined financially and emotionally. You got your family to safety, but how and where do you start over?
This tragedy will take years, if not a generation, to recover from.