Hence my negative vote, not for the change itself which is neutral for 80% of the users and probably more, but for prioritising it over changes everyone would benefit from.
In bigger picture, there has been long time much discussion related to training; is it reasonable at all to focus on training or would it be much more beneficial to use cheapest coach, train game shape, free throws etc. and just buy players. You could also have very limited amount of players, no need to get 48 minutes for a specific position, maybe use old cheap veterans. Only cost of coach is about the same than theoretical selling price increase, due to training, for your players per season.
Now this new feature would make life much harder for teams who are not training at all. And I think it is good for the game, training is more valued than earlier and above strategy will not captivate whole BB ;)
It's clear that most of teams, probably 80% as you said, are making small profit every week, because they are not in competitive league, or they are not fully fighting for a victory for this season. So this change doesn't impact for those teams this season....but I think this new feature is some kind of insurance for all teams, when they are putting "all-in", they know that if some other team is trying to "buy" victory, it will be much more expensive than earlier.
Thats why I cheer up for the latest changes!