I remember the T-34's being a popular plane to rent at the North Island Aero Club, - it was a fantastic plane to fly, me coming from a non-military flight training pipeline, - but the few T-34s we had got involved in some crashes and a few hull losses, and then the wing spar issue I think grounded the T-34s after that at the North Island club.
I have no idea whether the T-34s ever came back or if they developed a fix for the wing spar issue.
But I'm not surprised that the aero clubs have been dying off. I found the ones I was a member of (Kadena, Norfolk, and North Island) were especially invaluable early in my flight experience since I was not a military aviator.
All the extra requirements at the military aero clubs just made it easier to go out into the local GA flight community to go fly (especially in San Diego, where I just went over to Montgomery) and never come back.