Anyone interested in what happened when Disney's off-shored Italian animation team revolted should check out Allegro non troppo - a sendup of Fantasia.
You can argue that Disney was stretched way too far during this period due to Disney's grandiose dreams in Florida.
The difference was that Ollie and Frank hadn't bothered to write The Illusion of Life or tried to pass on their skills yet.
If you want to write evils of anti-union Disney, go a few decades earlier to the late 30s and early 40s and the strike.
This piece is not really clear about the reasons _why_ younger talent wasn't being trained on those techniques. If you read the story it seems that everybody was looking forward at people learning and helping them doing so... so why was it not being done at Disney ?
The link only mentions issues with the union, but it doesn't seem to me reasonable to think that it was the only reason.
A healthy organization takes these competing forces and integrates them. An unhealthy one (maybe one used to an overbearing, God-like leader?) clamps down, suppresses dissent, and lets the pressure build until something breaks.