It is my opinion that if there is a desire to modify Training, which I don't think has been modified since I've been here (maybe I'm forgetting an ancient modification?), it could be done. Yeah, it would change the market and strategies pretty quick for those paying attention, but if it's for the betterment of the game, then it should be done. Perhaps the compromise should be to make the announcement with a 3 or 4-season lead time. This won't make everyone happy, such as the manager who spent several seasons training a hard-to-train position like SF and won't be able to sell such a player for as much in the future, but at least these managers will still get to keep their players, and this will mean the loss of what, probably no more than a few hundred-thousand dollars for a player at the most for the best of these players. I think a typical manager spends no more than 3 or 4 seasons intensely training a player before making a different player a training priority, which is why I suggest that sort of time frame, to minimize the impact. For a change in Training that has been this long in coming, we could wait that long before a change is implemented. What's another 4 seasons? By know, we all know what the major issues with Training are, I say let's just fix them and have the perfect Training system by Season 20!
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!