When and if a state or local government declares a state of emergency the price of airfare, rental cars, etc. should be dropped and cannot be changed by airlines.
In the same instance no third parties are allowed to resell or offer sales for airlines or rental cars to prevent third party bidding wars. This opens up travel protection to all classes of people fleeing hurricanes or other natural disasters. It will also allow people to be more proactive about their travel plans if they are not as economically fortunate and try to wait it out until they see how a storm is developing over time
Maybe FEMA could fund this travel as a result BEFORE hurricanes hit versus trying to resolve damage after.