Firstly: sorry for not quoting the relevant posts, but I've quickly scanned through the last pages and don't feel like going back, or I'll have to catch up again.
Secondly, I'll enter my disclaimer here: I'm not, nor have I ever been in an area that could be affected by a hurricane, so anything I say here is from a general knowledge or, in case of aviation related matters, a professional perspective. I'm just trying to help if I can.
1. AoA does indeed have enclosed hallways for the suites but not for the Mermaid buildings. Unlike some deluxe resorts, however, the indoor hallways are not connected to the main building so you would still have to go outside to get to reception or the food court.
2. Disney's hurricane policy allows you to cancel without cost if a hurricane warning is issued for WDW or your home town within 7 days before your arrival. As far as I know no warnings have been issued for FL, so if you're torn between staying home or going to WDW for shelter, I think you'd be best keeping your reservation. This could go one of four ways:
a. a warning is issued for WDW, but not your home town -> you can stay home and cancel;
b. a warning is issued for your home town but not WDW -> you can choose where you want to go/stay based on safety and cancellation will be free;
c. a warning is issued for both WDW and your home town -> you can choose where you want to go/stay based on safety and cancellation will be free;
d. nor WDW, nor your home town get a warning -> you can go to WDW and have your trip as originally planned.
I may be missing something, but this seems like a win-win in a bad situation. Having a reservation allows you to have a back-up place for shelter if you need it and if you don't, you can cancel without cost and someone else who needs it can then use it.
Based on this theory, wouldn't it be a good idea for anyone who's anxious on the FL coast to make a reservation just in case until there is more certainty, I'm guessing Friday or so? This strategy does, of course, come with the condition that you cancel if you know you're staying put so someone else can get the room.
3. I completely agree about the airlines getting their planes away from the area, they are just too valuable. Just keep in mind that there is no garantee that there will still be flights out of MCO all day on Saturday, because severe winds may come to the area long before the heart of Irma does, regardless of whether it's coming straight to Orlando or not. MCO only has runways pointing in one direction and if the wind is coming in sideways it could be possible that crosswind limitations will be exceeded and planes will not be allowed to take off or land. Depending on the situation this could result in airlines ferrying out aircraft without passengers, as the rules can bend slightly if no passengers are onboard and the flights are done by pilots trained to do ferry flights.