The trick with decisions like this and, frankly, building a system is to evaluate players well. The focus isn't on whether to give up on a player. The focus is on getting your evaluations right more often than your competitors. Then make good decisions based on those evaluations.
Hyper-focusing on young talent and your system means nothing without good evaluations and, at times, good transactions based on those evaluations. Didn't the Cubs give up young talent for Busch? Was that wrong? Are you sure Busch is going to be good long term? And so on.
Right now, I'm just relying on Stearns and his team. Because one thing I know is that I don't know anything.