abby, I wonder if you would be a good candidate for trip insurance, if you are already wondering that strongly if you'll have to cancel?
Blueberrystamps, we just upgraded to APs from 5 day hoppers, and it felt MUCH better to upgrade towards the beginning of the trip, rather than at the end. First, it felt like we were USING the APs. Second, you get discounts on food (10% for the deluxe AP). Third, you know for sure that you have the money to upgrade, LOL.
If you're not staying onsite, you would definitely want to use the EE from your ticket (unless you bought the Gay Days tickets which I hear did not have EE on them?). If you ARE staying onsite though, you get EE each day of your visit that it's offered, so that's not a reason to hang on to the hoppers.
Really, except for EE for those who are offsite, there's no reason to hold on to the hoppers to the end. Also, you get your picture taken before getting sunburned (or gaining 5 pounds from all the food!)!