Ollie wrote:
So it is not just a case of old airplanes breaking up in the air. I suggest you head out to avweb.com and read what they put up on the subject.
http://www.avweb.com 
Well, I believe that's exactly what the problem is. According to the AVweb article the wing failed in a different location than any of the previous failures. To quote AVweb, "...the failure point was in the center fuselage section...", which would make one think that the canopy incident may not have played any role in this accident.
Ollie, you are assuming that the G limits are being exceeded in the Air Combat schools, while everyone else is playing by the rules. You may be correct, but until such a time as the FAA can prove to themselves that that's what happened I'm sure the T-34 fleet will stay on the ground.