I think I understand this better. In the larger population areas there are enough girls to run rec and travel programs side by side with very few girls playing both. No problem as all the girls are getting what they want out of their programs.
Out in the sticks it is a bit of a different story, take the TB girls out of Rec and Rec dies. When Rec dies so does the HS program. Or the HS program becomes a doormat. Between our varsity and JV we may have 25 girls out, only about 5 with TB experience. Obviously these TB girls make up the core of the varsity.
We do have solid contributors that have never played TB. By the time they are Juniors, they are able to contribute at the varsity level.
I have spent a lot of time to make our rec league better. Two of my rec pitchers have already been in the gym throwing. In this area, the non TB parents just don't start thinking softball until the snow melts. But, when you call them, or ask their daughter if she wants to come into the gym for some practice, the answer is almost always yes.