Even if it turns out that the theory about the vertical stabilizer is true, the thing you have to keep in mind is that these rare structural stress failures can happen on any type of aircraft at any time. If there was a known pattern of the same failure recurring on one model of aircraft, yes it would keep me off until the defect had been corrected, but if you start adding planes to the "won't fly" list because one particular aircraft had a structural fatigue problem, in addition to the A300, you can also add:

1.Boeing 737 - Top of the fuselage
sheared off on a Aloha or Hawaiian Air
flight in Hawaii.
2.Boeing 747 - The side of the fuselage blew
out on a United flight leaving HNL.
3.McDonnell-Douglas DC-9 - A rudder screw
malfunctioned due to structural fatigue on
an Alaska Airlines flight near LAX.