In my opinion the problem which needs to be solved is that, the way it is now, you don't have much options regarding how to train... at least at high levels.
You pick 5-6 youngsters, train 2 season of 1vs1 which is way better than the alternatives, train primaries skills, train secondary skills, maybe push his primaries to the cap... then repeat the whole process. The other option is, for those who have money to spare, don't even bother training.
Probably this is enough for the average player. But i'd like to mix it more. Like if I draft a good player, I don't like to be forced to sell other trainees and go for only youngsters, or be forced to sell the draftee.
A system like the one Brambauti suggested, if well implemented would be beneficial to players like me while not hurting those who prefer to train the "traditional way". Of course "well implemented" is the key here.