It's really pretty simple, allow for more flexibility and training options at more positions. The obvious one is the SF position which has be debated ad nauseum. The cons to this system are that there are very very few true SF's in the game and the only pro to maintaining the status quo is allowing those that have gone thru the pains of training SF's to reap their rewards.
Even that pro is a poor response as this is something that could be announced to be implemented at some point in the future, giving trainers time to reap the rewards of their past training while letting all user begin to plan for the changes.
Maybe it could be expanded in an extremely limited capacity, but I think the idea that "you can't have it all" is actually a strong point of the current system, and that there are several pro's beyond the obvious one of having a very good all-around player by the end of training?
1) If every position could be easily trained in every skill, I think the results of training something unique become less satisfying, because there was really not much sacrifice/effort involved and because more people are already doing it, and I would argue that the satisfaction of training an interesting player is something which sustains a lot of managers.
2) The ability to train players 'out of position' and still compete in their league is one of the very few advantages lower division teams have over top division teams: it's easier for me to one position train a center in OD for a season than it probably is for teams in the NBBA. If I want, I can try to use that advantage to build my team in a unique way that I believe will help me compete in the future, create players for resale who will demand a premium on the TL, etc.
Creating new, easier training choices would open up those options for established upper division teams while not really adding a lot for lower division managers, and the more advantages established teams have (or the fewer advantages new teams have), the harder it becomes for someone just starting out to climb to the top of the pyramid.
It's important for the game that people believe that with the right plan, they can reach the top; the fewer opportunities there are to try something unique to make up the ground, the more the game begins to feel like an endless slog of trying to be marginally better at things which established managers already have had time to get good at.
Not that anyone especially cares about my opinion, but I would hope they don't expand the training options, or that if they do it is in a way that still rewards going about it the 'hard' way.
Example: you can train OD from the center position, but it requires 65 minutes/week, and it
still trains a bit slower than two position training.
Many people did come from hattrick first though. The enthusiasm system is the one major component that seems to remain simply to allow an easier transition for users from hattrick to BB.
Overall I have to say the BB's really do a good job addressing issues and avoiding knee-jerk reactions to problems. Otherwise I wouldn't still be playing after almost 13 seasons.
Personally I like the enthusiasm system :) I think it adds a strategy component and also gives weaker teams a mechanism to increase their odds of winning games they might not normally be favored in. I would totally agree though that the BB's do really do an excellent job of making this game both fun and deep. Big thanks to them!