Last month, I got in contact with John Horne, who is the Coordinator of Rights and Reproductions for the Baseball Hall of Fame. He shared the good news that the Hall has, after a considerable delay, received a donation or grant to digitally copy their entire photo archive.
As a result, everything (including the entire McWilliams Collecltion) should be online by late spring or early summer. The Hall as a result is not currently taking any orders for prints or reproductions until the archive and transfer of images is complete. That should be in the first half of 2019, Horne seemed to indicate.
I'm sure there will still be righits restrictions, but there will be much more ready access to these images.
Copyright, Baseball Hall of Fame and Muiseum