This is a great question. Someone should talk to Driveline and have them franchise or get private equity funding for a broader physical rollout of locations. I mean is there a nationally recognized brand for High School and College training for baseball (or baseball and other sports). This is clearly lacking on a national scale and quite honestly is a real business opportunity.
I was able to tour the Atlanta Hawks practice facility a few years ago and they had a D1 sports franchise in there. Looked similar to driveline but not 100% focused on baseball. Just did a search and now I see one "coming soon" in the town next door. Thank you to the OP for making me think this through today!