If it hits Orlando the theme park will be the least of Disney's worries. Their Celebration development was very lightly constructed. I asked one of their sales reps about it and he told me "not to worry -they never get hurricanes up here."
My family has an already bought and paid for week to Disneyworld on Sept 11 (a great day for flying). Partially, this is a business trip. Based on my experience with How Things Work, Frances will either be a direct hit on Orlando (where it will stall for two days) or it will take a last second hard right turn and go right over Raleigh, NC.