We've had this convo before.
I truly don't believe the college game would help big men. The issues happen well before college. 4 years of college would not have helped a Javale. Wouldn't help Dwight either. Wouldn't help Curry eating himself out the NBA or Tyson Chandler.
I also don't believe Tim Duncan would have been swayed one way or the other.
In now the current college game would hurt them.
I think College would have definitely helped Tyson Chandler, he hasn't developed one bit since he hit the league. All that changed with him is that he's gotten stronger and understands the game better now. Dudes like that come into the league and are too skinny to work in the post, so they just eventually turn into the shot blocker/weakside defender that rebounds.
There is a decent amount of player development that takes place in college for big men IMO, they learn what works and what doesn't, they used to learn how to play big and operate in the post. I just don't think it's a coincidence that Duncan is the last great post player drafted, and before the influx of HS players and freshmen being drafted bigs usually hit the league at around 22 years old.