1) Remember, if Irma even gets close, ALL camping guests MUST leave The Fort.
. . . it is a forced evacuation
. . . if possible, leave with your camper/RV
. . . if not, WDW will try to put you up in a WDW resort room.
2) I have been through two hurricanes at WDW, and so far, no major impact.
3) But, I would never try to outguess a hurricane.
NOTE: We lived through a direct hit from Hugo in Charlotte, and do not want that experience again.