So if, instead, anyone would be trainable at any position each week, that just means that training will no longer be a choice or a cost-benefit decision, just a default "everyone does it" option. It will significantly slow down the erosion that causes higher level teams to eventually have to come back to the pack, and basically the richest teams will buy the best trainees and be able to custom-build the best new players while still competing full-bore with the best current players.
I have to say I disagree with this. Right now 25 million is essentially a hard cap. In this market, that is definitely not enough to buy the best trainees and the best players.
Also, I don't see how that new training system would benefit the richer teams more than the current system does. Right now the "richest teams" can just buy the best players and then sell them for virtually the same price (maybe even higher) when they get older and keep repeating this. Instead of focusing on training they can just buy the finished product and consistently have the best players.
I think the reason that erosion occurs is that many of these teams need to run deficits to be competitive at the highest level and so they eventually run out of money. Modifying the training system to allow users to train 5 players wouldn't really change this.
I'll disagree also but I think you have some good points and I admit I hadn't considered the hard cap recently since it's a new addition. But still, if you have these teams buying older players and then selling them a few seasons on for profit, they're still going to have enough money to throw at players they want to train.
But you're looking (it appears) at only the super high end trainees and trainers - which is always going to be an overpriced market. Where I think the problem with "free" training comes in is not that the top teams will swoop in to buy up all (both?) the All Time Greats each draft - that'd be a wasteful investment that wouldn't really fit in. What I expect would instead happen is that the Superstar/MVP range of players would be picked up, trained on the bench to be SFs primarily and cost effective big men or guards secondarily, and then they'll need to replace even fewer players due to attrition.
I'm not entirely opposed to that - I think it would be nice to have the option to actually be able to draft and develop a team at a pace that leaves a few seasons for FT/stamina training as well. I just know that there's always concern about upward mobility for newer teams and anything that makes it easier for teams to park themselves in the top division is likely to be highly unpopular.