The thing though is that this would help them to still be at the top so why wouldn't they want this to happen? I fail to see any logic at all behind your statement.
Because you're looking at it from only one viewpoint, or none.
In what world is to not be able to develop young players a advantage? If they actually could train they would have it easier when it comes to renewing their team as it gets older. And this would be a great benefit in comparison to how things work now.
That's my point -- it would benefit
everybody,
everybody would be able to train. Right now training is so f'd up that most managers cannot, or do not bother. All of a sudden there would be thousands of teams competing by training instead of just ten's (or to be generous, 100's). Some top managers see this and don't want the competition; they prefer to be big fish in small ponds. Some top managers would be okay with all managers being able to train because the game would be more fun with the added competition.
And I hadn't thought about it because I ignore tanking, but it would put a serious dent in tanking, too. Another good reason to reform training. Seems like every second thread eventually revolves around the need to reform training, even threads I do not participate in.