This post is what you get when you have people who have never been through a hurricane hearing people on TV saying you will die, and your kids will die too.. for Disney to stay closed for that long of a period of time would take a storm that would frankly have to hit Disney directly and at least be a cat 5 when hitting the shore.. and maintain a lot of strength as it comes inland.
I had a friend who I work with(against my suggestion of waiting out the storm to see what/if any major damage occurred) cancel a trip to Panama City the day before Hurricane Hermine came ashore(was allowed to cancel except deposit up to 24 hours prior to arrival, but was afraid power would be out so long they wouldnt have a working phone yet).. their trip wasn't for 2 weeks later.. and then they got ****ed when the hotel wouldn't give them a full refund.
Hurricanes, for the most part, with proper prep.. will NOT significantly effect the majority of people.. just because it is a hurricane does not mean its going to be flat ground and no structures remaining.. we have to remember, WDW has a good amount of elevation in Florida so flooding(the majority of damage that people see in Hurricanes) would have to be of biblical proportions to completely cause the parks to close. If that happens, I don't think your vacation will matter..